diff --git a/apps/desktop/src/components/GameModal.tsx b/apps/desktop/src/components/GameModal.tsx
new file mode 100644
index 0000000..55ff32a
--- /dev/null
+++ b/apps/desktop/src/components/GameModal.tsx
@@ -0,0 +1,108 @@
+import { useEffect } from 'react';
+import { useTranslation } from 'react-i18next';
+
+import { useAuth } from '../context/AuthContext';
+import { useGame } from '../hooks/useGame';
+import { ConnectFourBoard } from './ConnectFourBoard';
+import { TicTacToeBoard } from './TicTacToeBoard';
+import { XIcon } from './icons';
+
+interface Props {
+  gameId: string;
+  onClose: () => void;
+}
+
+export function GameModal({ gameId, onClose }: Props) {
+  const { t } = useTranslation();
+  const { game, loading, error, makeMove } = useGame(gameId);
+  const { session: auth } = useAuth();
+
+  useEffect(() => {
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') onClose();
+    };
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [onClose]);
+
+  const myUserId = auth?.user.id ?? null;
+  const myPlayerIdx: 0 | 1 | null =
+    !game || !myUserId
+      ? null
+      : game.players[0] === myUserId
+        ? 0
+        : game.players[1] === myUserId
+          ? 1
+          : null;
+  const isMyTurn = !!game && game.currentTurnUserId === myUserId;
+  const finished = !!game?.finishedAt;
+  const winnerIdx: 0 | 1 | null =
+    !game?.winnerUserId
+      ? null
+      : game.players[0] === game.winnerUserId
+        ? 0
+        : game.players[1] === game.winnerUserId
+          ? 1
+          : null;
+  const title =
+    game?.gameType === 'c4'
+      ? t('app:game.c4', { defaultValue: 'Vier-Gewinnt' })
+      : t('app:game.ttt', { defaultValue: 'Tic-Tac-Toe' });
+
+  const statusLine = (() => {
+    if (loading) return t('app:game.loading', { defaultValue: 'Lädt…' });
+    if (error) return error;
+    if (!game) return t('app:game.missing', { defaultValue: 'Spiel nicht gefunden.' });
+    if (finished) {
+      if (winnerIdx === null) return t('app:game.draw', { defaultValue: 'Unentschieden!' });
+      if (winnerIdx === myPlayerIdx) return t('app:game.you_win', { defaultValue: 'Du hast gewonnen!' });
+      return t('app:game.you_lose', { defaultValue: 'Du hast verloren.' });
+    }
+    if (myPlayerIdx === null) return t('app:game.spectator', { defaultValue: 'Du schaust nur zu.' });
+    if (isMyTurn) return t('app:game.your_turn', { defaultValue: 'Du bist dran' });
+    return t('app:game.opponent_turn', { defaultValue: 'Gegner ist dran…' });
+  })();
+
+  return (
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={title}
+      className="fixed inset-0 z-[80] flex flex-col bg-ink-950/95"
+    >
+      <header className="flex shrink-0 items-center justify-between border-b border-line/40 bg-surface-2 px-4 py-2">
+        <h2 className="font-display text-sm font-semibold text-fg">{title}</h2>
+        <button
+          type="button"
+          onClick={onClose}
+          aria-label={t('app:game.close', { defaultValue: 'Schließen' })}
+          className="flex h-7 w-7 cursor-pointer items-center justify-center rounded-md text-fg-muted hover:bg-surface-3 hover:text-fg"
+        >
+          <XIcon className="h-3.5 w-3.5" />
+        </button>
+      </header>
+
+      <div className="flex min-h-0 flex-1 items-center justify-center overflow-auto p-6">
+        {game?.gameType === 'ttt' ? (
+          <TicTacToeBoard
+            board={game.state.board}
+            myPlayerIdx={myPlayerIdx}
+            disabled={!isMyTurn || finished}
+            onMove={(cell) => void makeMove({ cell }).catch(() => {})}
+          />
+        ) : game?.gameType === 'c4' ? (
+          <ConnectFourBoard
+            board={game.state.board}
+            myPlayerIdx={myPlayerIdx}
+            disabled={!isMyTurn || finished}
+            onMove={(column) => void makeMove({ column }).catch(() => {})}
+          />
+        ) : null}
+      </div>
+
+      <footer className="flex shrink-0 items-center justify-center border-t border-line/40 bg-surface-2 px-4 py-3 text-sm font-medium text-fg">
+        {statusLine}
+      </footer>
+    </div>
+  );
+}