Uncle Grandpa Hidden is a free online game that's all about flexing your memory skills while getting a dose of monster truck madness. It's a classic tile-matching challenge where you've gotta flip those squares and pair them up. Nail all the matches to snag a win. Your mission? Crush it in the least moves possible across 4 levels. Just click or tap on the squares – easy peasy. Get in the zone and let's game on! Have a blast!