Start with go, distill it down to its essence using the Symple protocol, and you have Itsy. The rules are very short: A group is a maximal set of orthogonally adjacent pieces of a single colour. Groups can never merge. Each turn, in order: Grow: Add a piece adjacent to each of your existing groups Spawn: Add a piece to the board, forming a new group. If you cannot complete your turn (usually because a group is surrounded), you lose.

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