driftlock: slide puzzle

Every swipe moves every block at once. That is the whole game. A board is a grid of blocks, walls and coloured exits; a swipe slides each block as far as it can go until an edge, a wall or another block stops it. Distance is never a choice, so the puzzle is not about how far to move things — it is about arranging the things that stop them. 1,500 boards across five tiers, from 6x6 first steps to 8x8 Expert. Every one of them was generated, then solved by the game's own search before it was kept, so every board has a proven par — and the stars you earn are measured against it: three stars for coming within a quarter of it, two within half, and a fourth on the boards that hide stars to collect — clear one of those without leaving a star behind. A new puzzle every day. The daily challenge is a single board, the same for everyone, that turns over at midnight UTC. Play it, keep a streak, and…