Pieceproof

Pieceproof is a goal-based block puzzle on an 8x8 board. Each stage gives you a fixed set of pieces and a clear target: clear lines or shatter the ice. Stone counts as a filled cell: lines through it still clear, but the stone stays. There is no random spawning and no timer. Every board is solver-verified, so there is always a solution. You just have to find it. Features: 60 solver-verified stages in three chapters (Basics, Stone, Ice); Endless Run with 3 lives (unlocks after stage 10); a new daily puzzle every day with streaks; up to three stars per stage; Proven stamps; unlockable board themes; one undo per attempt and a free hint on every stage; colorblind patterns, reduced motion and keyboard support; plays on desktop and mobile, in portrait or landscape.