A really good option to play in your browser is https://vuqq.com/15-puzzle/ 15 Puzzle - Play online for free - 100%. This is that old-school tile-shifting game where you move squares around until the numbers fall into place. It’s completely free, runs instantly, and works on any device. It’s addictive, yet calming, and a nice brain exercise if you want something more thoughtful than quick action games.
