BASE 13

A remake of Battle City — the tank game from the NES — built on Godot. You defend the eagle at the bottom of the field, chew through brick, grab power-ups, and keep the enemy away from your base.

Status: playable on desktop and in the browser, two players over the network. Core, rendering, input, a 35-level campaign, NES-chip-style sound, splash screen, menu, pause, stats, high score, gamepad, builds for three platforms and the web. Two-player co-op: a room by code through our own server, or a direct connection on the local network; a dropped connection is survivable — the match catches up from the journal.

The room server also serves the game itself, packs into a Docker image and deploys with a single command. Next up: mobile platforms and the stores.

What we are building

Not a game "inspired by" it, but those exact rules: 35 levels, four kinds of enemy tank, six power-ups (helmet, clock, shovel, star, grenade, tank), brick, steel, water, forest and ice, star upgrades that reset on death, two-player co-op.

The fidelity bar is recognizable, without frame-by-frame obsession: someone who played the original should sit down and say "yes, that's it". There is no frame-level comparison against an emulator; every tunable number lives in one place and is dialed in by feel.

All content is our own: sprites and sound are generated by scripts from text descriptions, and the level layouts are ours. No Namco/Bandai assets or maps are used.

Platforms

What	State
Windows, macOS, Linux	builds, plays
Browser	builds, plays
Co-op: quick game, room by code, local network	works
Room server and game hosting in one image	works
Public server on the internet	needs a machine with an address — the code is there
Android, iOS	subproject 2
App Store, Google Play	subproject 4

How it works

The main architectural decision is a deterministic core without a single node.

All game logic lives in game/core/ as plain GDScript classes and knows nothing about the screen, the keyboard or the network. The simulation steps in fixed ticks of 1/60 of a second and takes exactly five bits per player as input: up, down, left, right, fire. All arithmetic is integer (coordinates are in 1/16 of a pixel), and randomness comes from our own seeded generator.

That buys three things:

The rules are testable without graphics. "A bullet does not pass through steel", "the shovel gives brick back after twenty seconds", "the grenade does not touch an enemy that is still blinking" — ordinary unit tests, run in seconds in headless mode.
Network co-op reduces to exchanging button presses. Both devices compute the same thing, so tens of bytes per second travel over the wire, not the state of the world.
Touch controls change nothing in the logic. They simply become another source of the same five bits.

The presentation layer reads state and draws it; it holds no state of its own. The core does not play sounds — it accumulates events, and the renderer decides how to show them.

Layout

game/          the Godot project: the whole game
  core/        simulation and campaign: rules without nodes and without the engine
  presentation/ rendering, sound, HUD, effects
  ui/          screens and the root switcher
  net/         connectivity: a room through the server, local network, rollback
  platform/    keyboard, gamepad, file reading, high score, server address
  levels/      35 layouts in a text format
  assets/      atlases, sounds, icon, splash — all generated from tools/
  tests/       GUT tests
server/        room server and game hosting — in Go, knows nothing about the game
deploy/        Prometheus scrape and alert rules, an Alloy example, the Grafana dashboard
tools/         content generators, test runner, builds
docs/          design and plans

All content — sprites, font, sounds, level layouts, icon and splash — is described as text in tools/ and assembled by scripts. What lives in the repository is a description, not a binary of unknown origin: the diff shows what changed, editing does not require an editor, and generation is reproducible.

Build and run

You need Godot 4.7.2.

export GODOT=/Applications/Godot.app/Contents/MacOS/Godot
"$GODOT" .                 # open the project in the editor
"$GODOT" --path . --headless --quit   # check that the project imports

Tests — together with the architectural boundary checks and the atlas verification:

./tools/test.sh

The first run on a machine downloads the server's Go modules, checked against server/go.sum; after that they come from the module cache.

Sprites are rebuilt from their text sources:

cd tools && python3 gen_sprites.py

How to play

From the project directory (the godot symlink comes with brew install --cask godot):

Command	What it does
`godot`	Run the game
`godot -e`	Open the project in the Godot editor
`godot --path <path to project>`	Run from any other folder

A built application no longer needs Godot: open "build/macos/BASE 13.app" after ./tools/build.sh, or drag it into Applications.

	Movement	Fire
Player 1	Arrows	Space
Player 2	W A S D	Tab

The menu has a NETWORK entry — the two-player game. Ways to meet:

Entry	What it does
`QUICK GAME`	Pairs you with the first person who pressed the same thing. No code, no address
`CREATE ROOM`	Opens a room on the server and shows a six-character code
`JOIN ROOM`	Asks for a code and seats you in that room
`LAN HOST`	Waits for a partner directly, showing your address on the local network
`LAN JOIN`	Asks for the partner's address

QUICK GAME is for playing with a stranger, CREATE ROOM with someone specific: you read the code out loud, and no passer-by will land in that room.

A room works from anywhere: both sides dial out, so there is no port to forward and no need to be on the same network. All it takes is a running server — see "Room server" below.

The game does not wait for the partner's keys. It guesses them — whatever the partner held last — and when the real ones arrive and differ, it steps back a few ticks and computes them again within one frame. Your own tank answers two ticks after the press. The game stands only when the partner has been silent for longer than 200 ms: a hidden tab, a dropped link, or a path too long for guessing to cover.

If the game stutters, look at the [net] lines — they appear every five seconds in the terminal, and in the browser in the developer console. L puts the same figures on screen:

[net] 300 ticks in 5000 ms (norm 5000), speed 100%, stops 0 (longest 0 ms), frozen 0 (longest 0 ms), rollbacks 8 (deepest 8), resim 3 ms, skips 1, lead 9 against 6

stops — times the game stood past those 200 ms for a moment, up to 150 ms: a path a little too long for guessing. These are the waits the server hears.
frozen — stands longer than that: the partner's hidden tab, a dropped link. Shown here, not sent to the server as waits.
rollbacks and deepest — how often a guess was wrong and how far back it had to go. On a path of about 110 ms to the server expect around eight ticks at the deepest.
resim — what stepping back cost this machine over the five seconds.
skips and lead — a side that got ahead of its partner lets one tick in twenty go until the two are level. When the partner is back from a stand, the lead the stand left is let go at once instead, before the picture moves again.

frozen means the partner went quiet; stops that keep coming mean the network. A speed noticeably below a hundred with neither and a large resim means the machine cannot keep up.

A direct connection (LAN HOST / LAN JOIN) does without the server, but on macOS 15 and newer the system asks for local network permission on the first connection. Without it the game will not find the partner, even though the port is open and the machines are on the same Wi-Fi. The permission is granted in System Settings → Privacy & Security → Local Network, and it is needed on both machines. Through a room there is no such fuss at all.

Esc pauses; while paused, Q exits to the menu and F toggles fullscreen. The same legend is shown at the bottom of the menu. A gamepad works alongside the keyboard: the d-pad and stick steer, the bottom or right button fires, Start pauses.

At startup the window is fitted to the monitor at an integer scale of 256×240: there is never any fractional stretching, which would give pixels different sizes. On a fourteen-inch laptop the window fits triple scale, and fullscreen fits quadruple.

Room server

A separate Go program. Its one outside dependency is Prometheus's own client library, for the metrics; the WebSocket layer is still written by hand. It builds into one file that you only have to copy onto a machine and run. It knows nothing about tanks: it sees a room code, the participants and the order of packets, and what those bytes mean is the game's business. So the same server will do for the next game too.

cd server && go run .            # on this machine, port 27014
cd server && go build -o relay . # one file you can carry away
./relay -addr=:27014

To check that it is alive: curl localhost:27014/health.

The port is deliberately not 8080: that one is taken on almost every work machine, and the client would silently have gone to somebody else's service.

By default the client looks for the server on its own machine. Another address is set with a flag:

godot -- --relay=ws://your-server:27014/ws

In the browser the address is derived from the page's address (https → wss), so it is enough to serve the static files and the room server from one host. A page parameter works for testing too, on a page opened from your own machine: ?relay=ws://localhost:27014/ws. A page served from anywhere else ignores it — otherwise a link to the real site could send the game to any server the link names.

A room lives as long as somebody is in it, plus five minutes for a dropped player to come back. There are no accounts yet: whoever knows the code gets in.

The same server also serves the game for the browser — with the -static flag:

./relay -static ./web        # game on / , socket on /ws , state on /health

One port for everything is not about thrift: the browser derives the socket address from the page's address, so from a single origin there is nothing to configure in the client at all.

Deployment image

./tools/image.sh             # web build, image, check that it comes up
docker run -p 27014:27014 base13:latest

Inside is scratch: the binary and the game's files, about eighty megabytes with the gzipped twins below, no system and no shell. Godot is deliberately kept out of the image — that would be a second binding to the engine version, living apart from project.godot; so docker build requires a ready build/web and fails with an explanation if it is missing.

The engine alone is forty megabytes, and ten in gzip. The image carries a gzipped twin of each large file, made once at build time, and the server hands it to any browser that accepts gzip. The proxy in front need not compress anything.

The image does no TLS: it listens on plain HTTP, and the certificate and the proxy in front of it are the machine owner's business. But without HTTPS the game will not start in the browser: Godot requires a secure origin, and only HTTPS and localhost qualify. Opening the build at http://192.168.x.x:27014/ from a second computer will not work — you get "Secure Context — Check web server configuration".

Settings come from environment variables; a flag overrides a variable, in case you need to bring up a second copy alongside:

Variable	What it sets
`PORT`	The port (the common convention among hosting platforms)
`ADDR`	The whole address, if you need to bind to one interface
`STATIC_DIR`	The folder with the game's files; empty means relay only
`MAX_ROOMS`	How many rooms at once, 250 by default. A room at its caps is about 4 MB, so 250 is about a gigabyte in the worst case; past it newcomers see `SERVER IS BUSY`
`METRICS_ADDR`	Where Prometheus reads the server's figures, for example `:27015`. Empty, the default, means no metrics listener at all. Its port must differ from the public one — compared as a number, so `027014` is still 27014 — or the server refuses to start
`METRICS_TOKEN`	A bearer token the metrics listener demands, at least 16 bytes. Environment only: a flag would show in `ps`

On SIGTERM the server stops accepting and says goodbye to the players with a close frame instead of cutting the connection: otherwise the client spends half a minute knocking at a room that is already gone. A restart ends matches anyway — the journal lives in memory.

How much it takes: the measurement BASE13_LOAD=1 go test -run TestLoadManyPairs ./server shows two hundred pairs (four hundred people) with no losses and nothing late. The limit is memory for the journals: a full match takes 4 MB, so a gigabyte is about two hundred and fifty simultaneous long matches.

You cannot scale out with a second instance: a pair must land on the same process, because the journal it catches up from lives next to it. Details are in the design doc.

What the proxy in front must do

The image speaks plain HTTP. Whatever terminates TLS in front of it has to do three things, and each one fails visibly when it is missing:

Pass the WebSocket upgrade through on /ws. Without it the page loads and the game starts, but every attempt to connect ends in NO CONNECTION.
Not buffer the response. A buffering proxy holds packets back and turns the match into a slideshow while every [net] line still reads 100%.
Allow a connection that is quiet for a while. A person waiting for a partner sends nothing for minutes. The server pings every twenty seconds and every client answers — a browser by itself — so the link is never silent longer than that; a proxy timeout under twenty seconds still cuts it.

Caddy does all three by itself:

game.example.com {
	reverse_proxy 127.0.0.1:27014
}

Nginx needs saying:

location / {
	proxy_pass http://127.0.0.1:27014;
	proxy_http_version 1.1;
	proxy_set_header Upgrade $http_upgrade;
	proxy_set_header Connection "upgrade";
	proxy_set_header Host $host;
	proxy_buffering off;
	proxy_read_timeout 3600s;
}

One location for everything: the page, /ws and /health live on one origin on purpose — that is what leaves the client with nothing to configure.

Limits per address belong to the proxy too: behind it the server sees every connection come from the proxy's own address, so it can cap the total but cannot tell one person from a thousand. With nginx that is limit_conn in a server block.

Publish the container's port on the loopback only — -p 127.0.0.1:27014:27014. Only the proxy needs to reach it; published on every interface it answers from the outside over plain http, where the browser build refuses to start and nobody can tell why.

Metrics

The server can show Prometheus and Grafana what stdout only hints at: connections and rooms against their limits, refusals and how connections ended, how many people sit down to play and how long they wait for a partner, and how the game actually runs for them — the round trip to each player, the server's own delay, and the pace players' games report. With the alert rules below, a full server or a desync reaches a person instead of a log.

It is off unless asked for. The figures go out on a port of their own, never the public one: the proxy in front forwards every path, so /metrics on the public port would be on the internet. There it is a 404, and tools/image.sh checks that it stays one.

openssl rand -hex 32 > metrics-token          # once; readable only by whoever runs the container
printf 'METRICS_TOKEN=%s\n' "$(cat metrics-token)" > metrics.env

docker run -d --name base13 --restart unless-stopped \
  -p 127.0.0.1:27014:27014 \
  -p 127.0.0.1:27015:27015 -e METRICS_ADDR=:27015 \
  --env-file metrics.env \
  ghcr.io/proshik/base13:<version>

127.0.0.1 in the second publish matters as much as in the first: without it the figures answer from outside. If Prometheus or Alloy runs in a container of its own, a docker network shared with base13 is better still — it reaches base13:27015 with nothing published at all. A binary without Docker listens on the loopback only: METRICS_ADDR=127.0.0.1:27015. Given an address beyond the machine and no token, it says so at startup.

The token is needed even with the loopback publish. -p 127.0.0.1:… only limits where the port is published on the host; any other container on the same docker bridge reaches the container's address directly, published or not. With METRICS_TOKEN set, a scrape without Authorization: Bearer <token> gets a 401. The token goes in through the environment, not a flag, because flags show in ps, and through --env-file, not -e METRICS_TOKEN=…, so it does not stay in the shell's history.

The image has no EXPOSE for the metrics port on purpose: docker run -P publishes every exposed port on every interface.

Ready-made examples live in deploy/:

File	What it is
`deploy/prometheus/scrape.yml`	A Prometheus configuration with the `relay` job and the token read from a file
`deploy/alloy/relay.alloy`	The same scrape through Grafana Alloy, sent on to Grafana Cloud or any remote-write store
`deploy/prometheus/alerts.yml`	Alert rules: down, restarting, near the limits, adding lag, starved of CPU, desyncs
`deploy/grafana/relay.json`	The dashboard: Now, Product, Lag and performance, Health, Resources

The job must be called relay: every rule and panel selects job="relay". Alloy does not evaluate rules — with Alloy, load alerts.yml into the store's ruler. The dashboard imports through Dashboards → New → Import and asks which Prometheus to read. server/deploy_test.go checks that every figure these files name is one the server really exposes, so a renamed metric fails the tests instead of leaving a panel quietly empty.

Point an uptime monitor at /health, not at /. A request for the page counts as a page load, and a monitor that checks every minute adds 1440 page loads a day that no player made.

What the server counts

Events, and what players' games say about themselves. A seating, a pairing, a refusal, a relayed packet, a window of ticks reported by a player's side — each is added to a count or a histogram and forgotten. The server keeps no list of who did what.

It never records an address, a room code, a seed, a game name, or any text a client sent as it was sent. Every label comes from a closed set the server defines: a platform it does not know becomes other, a version that is not three numbers becomes other, and only the ten most common versions among players seated right now get a series of their own. A test seats players in a room with a known code and seed and checks that neither appears in the scrape.

It does not count people. There is no identifier to count by, deliberately: "players" is who is seated right now, a seating is an event, and one person who plays three matches is three seatings. How many different people played is not something this server can say.

Figures from players' games — pace, waits, input delay, frame rate, desyncs, and the platform and version in the hello — are self-reported, and a client can forge them. The server reads a report into a fixed shape, clamps every figure to what a real window can be, takes at most one every four seconds per connection over time, and never relays, journals or logs it. That bounds what a forger can do; it does not stop a handful of fake clients from bending a distribution. The round trip is measured by the server's own pings, but a client can make its own figure worse by answering late.

The metrics carry no room codes; the logs do. Every line about a room names its code and game (room K7QX2M (private, game tanks): player 2 joined), so stdout deserves the same care as the machine itself.

Reading the lag panels

A match that stutters has one of three causes, and the Lag and performance row tells them apart with the same rule as the [net] lines:

Speed below 95% with waits — the game stood waiting for the partner's input: the network. Look at the round trip for that platform, and at the worst gap.
Speed below 95% without waits — nothing was waited for: the player's machine, or a frozen stand. The frame rate by platform shows a machine that cannot keep up; the worst gap shows a stand.
Round trip high, worst gap low — a slow but steady path. Guessing the partner's keys absorbs it for as long as the round trip fits in 200 ms: the speed holds and nothing waits. Past that the game stands, and the stands show as waits.
Worst gap high, round trip normal — jitter: Wi-Fi or a mobile link. A burst shorter than 200 ms is guessed through; a longer one stands the game.
Input delay above two — a player still on a build older than 0.6.0, which raised its delay from five to sixteen instead of guessing. Both lines under two mean everyone is on the current build.
Forward delay high — the server itself. Check the Go scheduler latency and CPU first.

The machine share includes frozen stands. A window in which the game stood still — a partner's hidden tab, a relay drop and return, the player's own hidden tab — is reported like any other, and it reads as low speed with no waits, which is the machine verdict. So before blaming players' machines, look at relay_packet_gap_worst_seconds: a stand shows there as a gap of seconds, and a slow machine does not. The same windows pull down the speed and frame rate panels.

Two things bend that rule. Players on 0.6.0 sent such stands as waits, so their frozen windows read as network. And on any build a window with a partner's stand can still carry a few one-frame stops right after it, while the two sides fall back into step, which also tips it to network.

What else the figures do not say:

cut disconnects include players whose socket failed on a write (a broken pipe, a reset), not only players evicted for falling behind.
A code room's wait for a partner includes the time the code took to reach them. Time played together and abandoned waits are observed when the empty room is swept, five to six minutes late, and rooms still open at a restart are never observed.
The forward delay misses writes that hit the five-second write limit; those become disconnects or evictions. Right after an eviction a burst of slow forwards is normal. relay_packets_total counts packets read from players, not packets delivered.
The worst gap includes whole pauses in the middle of a connection — menus, the STATS screen, a hidden tab. Read its buckets, not its mean.
Godot answers a ping once a frame, so desktop and native round trips include up to about 16 ms of the game loop; a browser answers at once.
The engine download time is a lower bound: socket and proxy buffers hide the rest, and behind nginx with proxy_buffering on it measures only the hop to the proxy. HEAD and 206 count as successful downloads; a 304 on the gzipped twin counts as identity.
iPadOS Safari sends a Macintosh user agent, so iPads count as web, not web_ios.
Versions are live players only, the ten most common plus other; while real traffic is low, a few fake clients can rotate fake versions through the ten.
A development build reports version 0.0.0: project.godot carries that placeholder, and only tools/stamp_version.sh at release time stamps the real number. So a local godot run and the web build tools/image.sh makes both show up as 0.0.0 in the version label, not as other and not as the repository's own version.
Single-player and LAN games never talk to the server, so they are not measured at all.

Testing on two laptops

The server comes up on one of them, and both clients go to it.

On laptop A:

ipconfig getifaddr en0        # your address, for example 192.168.31.234
cd server && go run . -addr=:27014
godot                         # in another window; the server is local, nothing to find

On laptop B:

curl http://192.168.31.234:27014/health  # first make sure the server is visible
godot -- --relay=ws://192.168.31.234:27014/ws

Then: A picks CREATE ROOM and reads out the code, B picks JOIN ROOM and enters it.

If curl does not answer, the game is not the problem: either the machines are on different networks, or -addr=:27014 was replaced with 127.0.0.1. If curl answers but the game says NO CONNECTION with an address on screen, macOS did not let the application onto the local network; the permission is in System Settings → Privacy & Security → Local Network.

None of this fuss will be there once the server moves to a real machine on the internet: then both sides dial out, and the local network has nothing to do with it.

Builds

./tools/build.sh

Puts builds for Windows, macOS and Linux into build/. You need the Godot 4.7.2 export templates — installed through Editor → Manage Export Templates, or by unpacking the official .tpz into ~/Library/Application Support/Godot/export_templates/.

The presets live in export_presets.cfg and are kept in the repository: without them the build is not reproducible. They hold no secrets for desktop; when Android arrives, the keystore passwords will live in environment variables, not in this file.

The macOS build is signed "to itself" but not notarized: Apple has not checked it, and the system will say so. This is how you open it — System Settings → Privacy & Security → scroll down to the message about the blocked application → "Open Anyway". Once per application. Right-click → "Open" no longer works for this case on macOS 15 and newer. Notarization requires a paid Apple account — that is subproject 4.

The web build lands in build/web/ and works from any static host — threads are off, so the host needs no special headers:

cd build/web && python3 -m http.server 8137

Open http://localhost:8137/. The address with ?selftest runs the reference scenario and prints the world hash on screen: it must match the desktop one, otherwise cross-platform co-op is impossible. The same on desktop — godot -- --selftest.

Checks and publishing

Every push to any branch runs ./tools/test.sh — the same run as locally: core isolation, server neutrality, atlas and sound verification against the manifests, the Go tests and all the GUT tests.

The image is not built on push. Publishing from every branch would fill up the registry, and the package budget is zero with a hard stop: run out of space and a real release will not go out either.

Release

Cut by hand from master: Actions tab → "release" workflow → Run workflow. Two fields: the version number without v, and what exactly to release.

What	What happens	Why separate
`server`	Web build, image into the registry, image checked by running it	Ships often; makes no desktop exports
`desktop`	Builds for Windows, macOS, Linux, a `vX.Y.Z` tag, a release with attachments	Three exports with texture rebuilds — slow and expensive
`both`	Both of the above

Desktop builds are expensive and the backend has to be updated often — hence the split. Only the desktop release places a git tag: that is what people download, while a server version may go out more than once.

By hand rather than automatically, because a release is something you hand to someone, and a human should decide when it is ready. A run from anything but master, or a repeat of a version already taken, is rejected by the workflow itself.

docker pull ghcr.io/proshik/base13:0.1.0
docker run -p 27014:27014 ghcr.io/proshik/base13:0.1.0

Image tag	When
`X.Y.Z`	a server release with that number
`latest`	the last one released
`sha-<commit>`	always — it shows exactly what is running on the server

To build the same thing by hand:

just --list                   # every task in the project
just build                    # all four platforms
just build Web                # for the browser only
just build Windows Linux macOS
just image                    # web build and image

just is an index, not a dependency. The task bodies live in tools/*.sh, they are called directly without it, and CI calls exactly those:

./tools/build.sh Web
./tools/image.sh

Godot and the export templates live in the run's cache: the templates weigh a gigabyte, and downloading them every time takes longer than everything else put together.

Documents

Design — game rules, world model, level format, testing strategy
Core implementation plan — 17 tasks, TDD
Playable-game design — rendering, input, campaign
Part B1 plan — 12 tasks, TDD
Part B2 design — sound, screens, high score, builds
Part B2 plan — 12 tasks, TDD
Co-op design — lockstep, input delay, hash comparison; superseded for network play by the rollback design below
Rooms and relay design — server, room codes, journal and reconnect
Quick game and image design — matchmaking, static hosting, Docker
Deployment plan — the image on a public machine behind a proxy; next up, not yet done
Network lag plan — the adaptive input delay of 0.5.0, since replaced by rollback
Metrics plan — Prometheus figures, alerts and a dashboard for the room server; shipped in 0.5.0
Rollback design — guessing the partner's keys and stepping back instead of waiting; shipped in 0.6.0
Rollback plan — 9 tasks, TDD
Homebrew cask plan — installation on macOS in one command; after the deployment
CLAUDE.md — invariants that must not be broken

Legal

An independent implementation. Battle City is a trademark and a copyrighted work of Namco/Bandai Namco Entertainment; this project is not affiliated with them and is not endorsed by them. The graphics, sound and level layouts were created from scratch.

Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
deploy		deploy
docs		docs
game		game
server		server
tools		tools
.dockerignore		.dockerignore
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
Dockerfile		Dockerfile
README.md		README.md
justfile		justfile

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