await window.RemixSDK.ready();

const savedState = window.RemixSDK.gameState;

const state = savedState ?? { score: 0, level: 1 };

window.RemixSDK.singlePlayer.actions.saveGameState({
  gameState: { score: player.score, level: player.level },
});

<script>
  let clicks = 0;

  async function init() {
    await window.RemixSDK.ready();

    // Load
    const gameState = window.RemixSDK.gameState;
    if (gameState && typeof gameState.clicks === "number") {
      clicks = gameState.clicks;
    }

    document.getElementById("count").textContent = clicks;
    document.getElementById("btn").addEventListener("click", () => {
      clicks++;
      document.getElementById("count").textContent = clicks;

      // Save after every click
      window.RemixSDK.singlePlayer.actions.saveGameState({
        gameState: { clicks },
      });
    });
  }

  init();
</script>

<script>
  let level = 1;
  let coins = 0;

  async function init() {
    await window.RemixSDK.ready();

    // Load
    const saved = window.RemixSDK.gameState;
    if (saved) {
      level = saved.level ?? 1;
      coins = saved.coins ?? 0;
    }

    startLevel(level);
  }

  function onLevelComplete() {
    level++;
    coins += 10;

    // Save at level transitions
    window.RemixSDK.singlePlayer.actions.saveGameState({
      gameState: { level, coins },
    });

    startLevel(level);
  }

  init();
</script>