An interesting one I made recently is related to a game published a couple of days ago here in HN called "infinite craft" https://neal.fun/infinite-craft/

The game does not have any save mechanism, so I made a bookmarklet that loads and autosaves to localStorage

```

javascript:(function(){ const exportState = () => JSON.stringify({ discoveries: window.$nuxt.$root.$children[2].$children[0].$children[0]._data.discoveries, elements: window.$nuxt.$root.$children[2].$children[0].$children[0]._data.elements });

    const importState = (state) => {
        const { discoveries, elements } = JSON.parse(state);
        const gameInstance = window.$nuxt.$root.$children[2].$children[0].$children[0]._data;
        gameInstance.discoveries = discoveries;
        gameInstance.elements = elements;
    };

    /* Set up a MutationObserver to listen for changes in the DOM and automatically export the current state. */
    const observer = new MutationObserver((mutations) => {
        const state = exportState();
        localStorage.setItem('gameState', state);
    });

    /* Start observing DOM changes to auto-save the game state. */
    const startObserving = () => {
        const targetNode = document.querySelector('.sidebar');
        observer.observe(targetNode, { childList: true, subtree: true });
    };

    /* Check for a saved state in localStorage and import it if available. */
    const savedState = localStorage.getItem('gameState');
    if (savedState) importState(savedState);
    else localStorage.setItem('gameState', exportState() );

    startObserving();

})();

```

Oh that's just awesome. Using this with the send to obsidian addon sounds like the best of ideas