diff --git a/src/lib/GameData.ts b/src/lib/GameData.ts
index 10a30f7..df5f06e 100644
--- a/src/lib/GameData.ts
+++ b/src/lib/GameData.ts
@@ -1,10 +1,11 @@
 import { hasOnlyKeys, hasProperty } from "./validation";
 import { isId, type Id } from "./Id";
 import type { State } from "./State";
+import { isGamePlayer, type GamePlayer } from "./GamePlayer";
 
 export interface GameData {
 	isStarted: boolean;
-	players: { id: Id; username: string }[];
+	players: GamePlayer[];
 	state: State;
 }
 
@@ -17,13 +18,7 @@ export function isGameData(target: unknown): target is GameData {
 		const { players } = target as any;
 
 		for (const player of players) {
-			if (!isId(player.id)) {
-				return false;
-			}
-
-			if (!hasProperty(player, "username", "string")) {
-				return false;
-			}
+			if (!isGamePlayer(player)) return false;
 		}
 	} else {
 		return false;
diff --git a/src/lib/GamePlayer.ts b/src/lib/GamePlayer.ts
new file mode 100644
index 0000000..c0afc7b
--- /dev/null
+++ b/src/lib/GamePlayer.ts
@@ -0,0 +1,24 @@
+import { isId, type Id } from "./Id";
+import { hasOnlyKeys, hasProperty } from "./validation";
+
+export interface GamePlayer {
+	id: Id;
+	username: string;
+	isReady: boolean;
+}
+
+export function isGamePlayer(target: unknown): target is GamePlayer {
+	if (!isId((target as any).id)) {
+		return false;
+	}
+
+	if (!hasProperty(target, "username", "string")) {
+		return false;
+	}
+
+	if (!hasProperty(target, "isReady", "boolean")) {
+		return false;
+	}
+
+	return hasOnlyKeys(target, ["username", "id", "isReady"]);
+}
diff --git a/src/lib/components/PlayerList.svelte b/src/lib/components/PlayerList.svelte
index e10fbdd..cec7f59 100644
--- a/src/lib/components/PlayerList.svelte
+++ b/src/lib/components/PlayerList.svelte
@@ -1,19 +1,29 @@
-<script>
+<script lang="ts">
+	import type { GamePlayer } from "$lib/GamePlayer";
 	import { getMeContext } from "$lib/meContext";
 
-	const { players } = $props();
-
+	const { players, withReadyStatus = false } = $props();
 	const me = getMeContext();
+
+	function getClasses(player: GamePlayer, withReadyStatus: boolean) {
+		let classes = "";
+
+		if (withReadyStatus) {
+			classes += player.isReady ? "ready" : "unready";
+		}
+
+		if (me !== null && player.id === me.id) {
+			classes += " you";
+		}
+
+		return classes;
+	}
 </script>
 
 <div class="list">
 	<ol>
 		{#each players as player}
-			{#if me !== null && player.id === me.id}
-				<li class="you">you</li>
-			{:else}
-				<li>{player.username}</li>
-			{/if}
+			<li class={getClasses(player, withReadyStatus)}>{player.username}</li>
 		{/each}
 	</ol>
 </div>
@@ -23,6 +33,18 @@
 		font-weight: bold;
 	}
 
+	.ready::after {
+		content: " [ready]";
+		color: green;
+		font-weight: bold;
+	}
+
+	.unready::after {
+		content: " [unready]";
+		color: red;
+		font-weight: bold;
+	}
+
 	.list {
 		border: 1pt gray solid;
 		background: white;
diff --git a/src/lib/server/Game.ts b/src/lib/server/Game.ts
index 6dac908..ae96d71 100644
--- a/src/lib/server/Game.ts
+++ b/src/lib/server/Game.ts
@@ -1,9 +1,10 @@
 import type { Id } from "../Id";
 import type { GameData } from "../GameData";
 import type { State } from "../State";
+import type { GamePlayer } from "$lib/GamePlayer";
 
 export class Game implements GameData {
-	players: { id: Id; username: string }[];
+	players: GamePlayer[];
 	isStarted: boolean;
 	state: State;
 
@@ -22,8 +23,18 @@ export class Game implements GameData {
 		return game;
 	}
 
-	addPlayer(id: Id, username: string) {
-		this.players.push({ id, username });
+	addPlayer(player: GamePlayer) {
+		this.players.push(player);
+	}
+
+	setPlayerReady({ id: playerId, isReady }: GamePlayer) {
+		const player = this.players.find(({ id }) => playerId === id);
+
+		if (!player) return null;
+
+		player.isReady = isReady;
+
+		return player;
 	}
 
 	start() {
diff --git a/src/lib/server/requestTools.ts b/src/lib/server/requestTools.ts
index 7780cf7..58a2f06 100644
--- a/src/lib/server/requestTools.ts
+++ b/src/lib/server/requestTools.ts
@@ -2,6 +2,8 @@ import type { LocalCredentials } from "./auth";
 
 export enum ResourceId {
 	Game = "gameid",
+	Turn = "turnid",
+	Player = "playerid",
 }
 
 export function getUser(locals: { user: LocalCredentials }) {
diff --git a/src/lib/server/responseBodies.ts b/src/lib/server/responseBodies.ts
index 5378f8b..6bb885b 100644
--- a/src/lib/server/responseBodies.ts
+++ b/src/lib/server/responseBodies.ts
@@ -10,6 +10,10 @@ export function createdResponse(id: string) {
 	return Response.json({ item: id }, { status: 201 });
 }
 
+export function conflictResponse() {
+	return Response.json({ error: "Conflict" }, { status: 409 });
+}
+
 export function tokenResponse(token: string) {
 	return Response.json({ access_token: token });
 }
diff --git a/src/lib/server/test/Game.spec.ts b/src/lib/server/test/Game.spec.ts
index 77a0420..42eec30 100644
--- a/src/lib/server/test/Game.spec.ts
+++ b/src/lib/server/test/Game.spec.ts
@@ -13,9 +13,9 @@ describe("Game", () => {
 
 			equal(game.players.length, 0);
 
-			game.addPlayer(idString, user);
+			game.addPlayer({ id: idString, username: user, isReady: false });
 			equal(game.players.length, 1);
-			deepEqual(game.players[0], { id: idString, username: user });
+			deepEqual(game.players[0], { id: idString, username: user, isReady: false });
 		});
 	});
 
diff --git a/src/lib/test/GameData.spec.ts b/src/lib/test/GameData.spec.ts
index a1b9f31..a9eea47 100644
--- a/src/lib/test/GameData.spec.ts
+++ b/src/lib/test/GameData.spec.ts
@@ -30,12 +30,25 @@ describe("GameData", () => {
 		});
 
 		it("rejects an object with a malformed players array", () => {
-			const data: unknown = {
-				players: [{ id: idString }],
+			let data: unknown = {
+				players: [{ id: idString, username: "Mr. User" }],
 				state: {},
 				isStarted: false,
 			};
+			equal(isGameData(data), false);
 
+			data = {
+				players: [{ id: idString, isReady: false }],
+				state: {},
+				isStarted: false,
+			};
+			equal(isGameData(data), false);
+
+			data = {
+				players: [{ username: "Mr. User", isReady: false }],
+				state: {},
+				isStarted: false,
+			};
 			equal(isGameData(data), false);
 		});
 
@@ -50,7 +63,7 @@ describe("GameData", () => {
 
 		it("rejects an object with extra properties", () => {
 			const data: unknown = {
-				players: [{ username: "Mr. User", id: idString }],
+				players: [{ username: "Mr. User", id: idString, isReady: false }],
 				isStarted: false,
 				state: {},
 				extra: true,
@@ -61,7 +74,7 @@ describe("GameData", () => {
 
 		it("should accept a proper GameData object", () => {
 			const data: unknown = {
-				players: [{ username: "Mr. User", id: idString }],
+				players: [{ username: "Mr. User", id: idString, isReady: false }],
 				state: {},
 				isStarted: false,
 			};
diff --git a/src/lib/test/GameEvent.spec.ts b/src/lib/test/GameEvent.spec.ts
index d44a0af..3c8f80a 100644
--- a/src/lib/test/GameEvent.spec.ts
+++ b/src/lib/test/GameEvent.spec.ts
@@ -58,11 +58,13 @@ describe("Game Events", () => {
 		const playerOne = {
 			id: createId(),
 			username: "Player One",
+			isReady: false,
 		};
 
 		const playerTwo = {
 			id: createId(),
 			username: "Player Two",
+			isReady: false,
 		};
 
 		it("should throw if the kind is unkown", () => {
diff --git a/src/routes/api/games/[gameid]/players/[playerid]/+server.ts b/src/routes/api/games/[gameid]/players/[playerid]/+server.ts
new file mode 100644
index 0000000..67a7b18
--- /dev/null
+++ b/src/routes/api/games/[gameid]/players/[playerid]/+server.ts
@@ -0,0 +1,60 @@
+import type { GameData } from "$lib/GameData";
+import { isGamePlayer, type GamePlayer } from "$lib/GamePlayer";
+import { isListing } from "$lib/Listing";
+import { Game } from "$lib/server/Game";
+import { updateListing } from "$lib/server/modifyListing";
+import {
+	readListingById,
+	ServerCollections,
+	writeUpdatedListing,
+} from "$lib/server/mongo";
+import { getBody, getParam, ResourceId } from "$lib/server/requestTools";
+import {
+	badRequestResponse,
+	conflictResponse,
+	notFoundResponse,
+	singleResponse,
+} from "$lib/server/responseBodies";
+import type { RequestHandler } from "@sveltejs/kit";
+
+export const PUT: RequestHandler = async ({ params, request }): Promise<Response> => {
+	const id = getParam(params, ResourceId.Game);
+
+	if (id === null) {
+		return badRequestResponse("missing playerid parameter");
+	}
+
+	let player: GamePlayer | null;
+	try {
+		player = await getBody(request, isGamePlayer);
+	} catch (err) {
+		return badRequestResponse("missing player body");
+	}
+
+	if (!player) {
+		return badRequestResponse("malformed request");
+	}
+
+	const listing = await readListingById(ServerCollections.Games, id, isListing<GameData>);
+	if (!listing) {
+		return notFoundResponse();
+	}
+
+	if (listing.data.isStarted === true) {
+		return conflictResponse();
+	}
+
+	const game = Game.from(listing.data);
+	if (game.setPlayerReady(player) === null) return notFoundResponse();
+
+	// TODO: there's a potential race condition here where some player is unreadying as this
+	//       function is running. This should do some kind of check in MongoDB to make sure
+	//       all players are ready if it's starting the game. For now: good enough.
+	if (game.players.every(({ isReady }) => isReady)) {
+		game.start();
+	}
+
+	await writeUpdatedListing(ServerCollections.Games, updateListing(listing, game));
+
+	return singleResponse(game);
+};
diff --git a/src/routes/api/games/[gameid]/[turns]/+server.ts b/src/routes/api/games/[gameid]/turns/[turnid]/+server.ts
similarity index 98%
rename from src/routes/api/games/[gameid]/[turns]/+server.ts
rename to src/routes/api/games/[gameid]/turns/[turnid]/+server.ts
index a51ba2c..feaff62 100644
--- a/src/routes/api/games/[gameid]/[turns]/+server.ts
+++ b/src/routes/api/games/[gameid]/turns/[turnid]/+server.ts
@@ -12,7 +12,6 @@ import {
 import { getBody, getParam, getUser, ResourceId } from "$lib/server/requestTools";
 import {
 	badRequestResponse,
-	createdResponse,
 	notFoundResponse,
 	singleResponse,
 } from "$lib/server/responseBodies";
diff --git a/src/routes/games/+page.svelte b/src/routes/games/+page.svelte
index 56fea7d..dc90688 100644
--- a/src/routes/games/+page.svelte
+++ b/src/routes/games/+page.svelte
@@ -23,9 +23,7 @@
 	<div class="game-listing">
 		<div>{prettyDate(new Date(game.createdAt))}</div>
 		<div>
-			{#each games as game}
-				<PlayerList players={game.data.players} />
-			{/each}
+			<PlayerList players={game.data.players} />
 		</div>
 		<form method="GET" action={`/games/${game.id}`}>
 			<input type="submit" value="JOIN" />
@@ -40,20 +38,20 @@
 
 	.game-listing {
 		display: flex;
-		gap: 3rem;
+		gap: 1rem;
 		padding: 0.5rem;
 	}
 
-	.game-listing > div {
-		flex: 1 1 auto;
+	.game-listing > * {
+		flex: auto;
 	}
 
-	form {
-		display: flex;
-		flex: 1 1 auto;
+	.game-listing > div:first-child {
+		max-width: 12rem;
 	}
 
 	form input {
 		width: 100%;
+		height: 100%;
 	}
 </style>
diff --git a/src/routes/games/[gameid]/+page.server.ts b/src/routes/games/[gameid]/+page.server.ts
index 80b0188..061ee73 100644
--- a/src/routes/games/[gameid]/+page.server.ts
+++ b/src/routes/games/[gameid]/+page.server.ts
@@ -4,13 +4,14 @@ import { isServerResponse } from "$lib/ServerResponse";
 import { error } from "@sveltejs/kit";
 import type { PageServerLoad } from "./$types";
 
-export const load: PageServerLoad = async ({ fetch, params, cookies }) => {
+export const load: PageServerLoad = async ({ fetch, params, cookies, depends }) => {
 	const url = `/api/games/${params.gameid}`;
 	let res: Response;
 	let body: unknown;
-
 	const token = cookies.get("access_token");
 
+	depends(url);
+
 	if (!token) {
 		error(401);
 	}
@@ -31,7 +32,10 @@ export const load: PageServerLoad = async ({ fetch, params, cookies }) => {
 	}
 
 	if ("item" in body && isListing<GameData>(body.item, isGameData)) {
-		return { game: body.item };
+		return {
+			game: body.item,
+			token,
+		};
 	} else {
 		error(res.status, "unable to fetch game data");
 	}
diff --git a/src/routes/games/[gameid]/+page.svelte b/src/routes/games/[gameid]/+page.svelte
index b806597..b068c19 100644
--- a/src/routes/games/[gameid]/+page.svelte
+++ b/src/routes/games/[gameid]/+page.svelte
@@ -1,8 +1,30 @@
 <script lang="ts">
+	import { invalidate } from "$app/navigation";
 	import PlayerList from "$lib/components/PlayerList.svelte";
+	import type { Me } from "$lib/me";
 	import type { PageData } from "./$types";
+
 	let { data: page }: { data: PageData } = $props();
-	const handleSubmit = () => {};
+	function getHandler(gameId: string, me: Me) {
+		return async () => {
+			const playerIndex = page.game.data.players.findIndex(
+				({ id }) => id === page.me?.id,
+			);
+			const target = page.game.data.players[playerIndex];
+			const update = { ...target, isReady: !target.isReady };
+			let response = await fetch(`/api/games/${gameId}/players/${me.id}`, {
+				method: "PUT",
+				headers: [["Authorization", page.token]],
+				body: JSON.stringify(update),
+			});
+
+			if (response.status !== 200) {
+				throw new Error("unable to set ready");
+			}
+
+			invalidate(`/api/games/${gameId}`);
+		};
+	}
 </script>
 
 {#if page.game.data.isStarted}
@@ -11,12 +33,19 @@
 	<h1>This is some lobby</h1>
 	<div id="lobby">
 		<div id="players">
-			<PlayerList players={page.game.data.players} />
+			<div id="player-list">
+				<PlayerList players={page.game.data.players} withReadyStatus />
+			</div>
+			<input
+				id="ready"
+				type="button"
+				value="Set Ready"
+				onclick={getHandler(page.game.id, page.me!)}
+			/>
+		</div>
+		<div id="chat" style="background: palevioletred">
+			<span>Chat Feature Under Construction</span>
 		</div>
-		<div id="chat" style="background: pink"></div>
-	</div>
-	<div id="controls">
-		<input type="button" value="Start Game" onsubmit={handleSubmit} />
 	</div>
 {/if}
 
@@ -30,14 +59,30 @@
 
 	#players {
 		flex: 1;
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+	}
+
+	#player-list {
+		flex: auto;
 	}
 
 	#chat {
 		flex: 2 2;
 	}
 
-	#controls {
-		margin: 1rem 0;
-		text-align: right;
+	#ready {
+		height: 4rem;
+	}
+
+	#chat span {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		height: 100%;
+		color: white;
+		font-weight: bold;
+		text-transform: uppercase;
 	}
 </style>