Sunder: Split Logic Puzzle

Cut a pile in two. Nothing moves, nothing merges. Finish with every pile equal.

Piles of identical blocks, and exactly one thing you can do to them: cut one pile into two.

That is the whole move list. Nothing ever moves from one pile to another, nothing ever merges back together, and no pile ever gets taller than it started. Every cut you make is permanent and the board only ever gets wider.

The board is finished when every pile on it is the same height. Since cutting is all you have, the final height is decided the moment you choose your first cut — pick wrong and you can see it coming three moves out. Undo is there for exactly that moment.

The arithmetic is simple and the ordering is not, which is the point. A pile of twelve can become two sixes or a nine and a three, and the board usually has an opinion about which.

Every board is generated and then solved before it ships, so the cut count you are aiming at is a real number rather than a guess. No timer and no lives. The one limit is a generous move budget - five times the shortest solution found by search, and never under 20 - shown as you play. Works offline.