Stackdle is a daily stacking game by Amountle, built around a simple balancing challenge: arrange five shapes into the tallest stable tower you can. Players can move and rotate pieces while gravity is paused, then test a layout to see whether every shape settles and holds for two seconds. Each daily puzzle allows three attempts, and the best qualifying height becomes the player’s score.

Between attempts, players can adjust their arrangement, continue from a stack that held, or undo changes. The game also includes unlimited practice tests on other hands, a catalogue of 30 shapes, past daily towers, and personal statistics such as best height and streak. A rotating collection explores different shapes and foundations, with the same daily setup available to everyone at midnight UTC.

Once daily attempts are complete, players can unlock the matching hand and its solutions. Stackdle saves progress in the browser without requiring an account, and qualifying daily layouts are verified before appearing in community results