One rule: tap an arrow, and it clears its pair.
Every arrow lies along its own axis. Tap it and it fires both ways at once, sweeping the line until it meets a partner of its colour. Two arrows cross — both leave the board, and everything between them goes too.
Nothing falls, nothing spawns. The field only gets emptier, and the order in which you empty it is the whole puzzle.
Free · works offline · no sign-upFive hand-made levels teach the rule — from a five-by-five opening to a wall of 141 arrows. After that the game keeps building boards of its own, each one solvable by construction.
24 arrows · 3 colours
47 arrows
69 arrows · 4 colours
94 arrows · 2 stars
141 arrows · 5 coloursOne rule takes ten seconds to learn. The order takes rather longer.