diff --git a/app/src/js/game.ts b/app/src/js/game.ts
new file mode 100644
index 0000000..f6938ff
--- /dev/null
+++ b/app/src/js/game.ts
@@ -0,0 +1,56 @@
+import { type Message, Context } from "../shared/types.js"
+import { focusInput } from "./focus.js"
+import { $ } from "./dom.js"
+import { randomId } from "../shared/utils.js"
+import { setStatus, addOutput } from "./scrollback.js"
+import { browserCommands } from "./commands.js"
+
+let oldMode = "cinema"
+
+export async function handleGameStart(msg: Message) {
+  const msgId = msg.id as string
+  const name = msg.data as string
+  const game = await import(`/command/${name}`)
+  const id = randomId()
+  let stopGame = false
+
+  addOutput(msgId, { html: `<canvas id="${id}" class="game active" height="540" width="960" tabindex="0"></canvas>` })
+
+  if (document.body.dataset.mode === "tall") {
+    browserCommands.mode?.()
+    oldMode = "tall"
+  }
+
+  setStatus(msgId, "ok")
+
+  const canvas = $(id) as HTMLCanvasElement
+  const ctx = new Context(canvas.getContext("2d")!)
+  canvas.focus()
+  canvas.addEventListener("keydown", e => {
+    e.preventDefault()
+
+    if (e.key === "Escape" || (e.ctrlKey && e.key === "c")) {
+      stopGame = true
+      if (oldMode === "tall") browserCommands.mode?.()
+      canvas.classList.remove("active")
+      canvas.style.height = canvas.height / 2 + "px"
+      canvas.style.width = canvas.width / 2 + "px"
+      focusInput()
+    }
+  })
+
+  let last = 0
+  function loop(ts: number) {
+    if (stopGame) return
+
+    const delta = ts - last
+    if (delta >= 1000 / 30) {
+      if (game.update) game.update(delta)
+      if (game.draw) game.draw(ctx)
+      last = ts
+    }
+    requestAnimationFrame(loop)
+  }
+  requestAnimationFrame(loop)
+}
+
diff --git a/app/src/js/shell.ts b/app/src/js/shell.ts
index 7bcd808..ceda0ff 100644
--- a/app/src/js/shell.ts
+++ b/app/src/js/shell.ts
@@ -2,14 +2,12 @@
 // The shell runs on the server and processes input, returning output.
 
 import type { Message, CommandResult, CommandOutput } from "../shared/types.js"
-import { Context } from "../shared/types.js"
 import { addInput, setStatus, addOutput, appendOutput, replaceOutput } from "./scrollback.js"
 import { send } from "./websocket.js"
 import { randomId } from "../shared/utils.js"
 import { addToHistory } from "./history.js"
-import { focusInput } from "./focus.js"
 import { browserCommands, cacheCommands } from "./commands.js"
-import { $ } from "./dom.js"
+import { handleGameStart } from "./game.js"
 
 export function runCommand(input: string) {
     if (!input.trim()) return
@@ -84,52 +82,3 @@ function handleStreamReplace(msg: Message) {
 function handleStreamEnd(_msg: Message) {
 }
 
-let oldMode = "cinema"
-
-async function handleGameStart(msg: Message) {
-    const msgId = msg.id as string
-    const name = msg.data as string
-    const game = await import(`/command/${name}`)
-    const id = randomId()
-    let stopGame = false
-
-    addOutput(msgId, { html: `<canvas id="${id}" class="game active" height="540" width="960" tabindex="0"></canvas>` })
-
-    if (document.body.dataset.mode === "tall") {
-        browserCommands.mode?.()
-        oldMode = "tall"
-    }
-
-    setStatus(msgId, "ok")
-
-    const canvas = $(id) as HTMLCanvasElement
-    const ctx = new Context(canvas.getContext("2d")!)
-    canvas.focus()
-    canvas.addEventListener("keydown", e => {
-        e.preventDefault()
-
-        if (e.key === "Escape" || (e.ctrlKey && e.key === "c")) {
-            stopGame = true
-            if (oldMode === "tall") browserCommands.mode?.()
-            canvas.classList.remove("active")
-            canvas.style.height = canvas.height / 2 + "px"
-            canvas.style.width = canvas.width / 2 + "px"
-            focusInput()
-        }
-    })
-
-    let last = 0
-    function loop(ts: number) {
-        if (stopGame) return
-
-        const delta = ts - last
-        if (delta >= 1000 / 30) {
-            if (game.update) game.update(delta)
-            if (game.draw) game.draw(ctx)
-            last = ts
-        }
-        requestAnimationFrame(loop)
-    }
-    requestAnimationFrame(loop)
-}
-