678KKHollow

Play a polished offline number-merging puzzle with a clean 4x4 board, quick controls, and long-session replayability. Start a classic run and push for a higher score, a larger tile, and smarter board management. Each valid move shifts the whole board at once, merges equal tiles, and creates a new tile only when the board actually changes. Challenge chapters add fixed starting layouts, move limits, blockers, and special objectives. Some levels ask you to reach a target tile, some ask you to clear fixed blockers, and others ask you to keep a corner open while you build a stronger board. The game also includes one-step undo, pause and resume, statistics, adjustable swipe sensitivity, animation controls, theme options, digit sizing, and a simple guide for learning the rules. Progress, preferences, and statistics are stored locally on the device so the game stays usable offline.