Beneath the visuals is a pure rule system — a small state engine where
every level is a reduction problem.
The board as state. Each level is a configuration of cells and symbols. Every drag produces a state transition: the game is, at its core, navigating a state space toward the one with a single piece.
Reaction rules. When two symbols meet, their rule is looked up: merge and evolve the shape, transform the whole board, or open the door to undoing a step and exploring another solution branch.
Symbol evolution. Pieces don't add up: they evolve. The right chain of merges unlocks advanced transformations that can change the global state and force you to rethink your strategy.
Level design. Every level is built so that attractive false solutions exist: the easy way almost works, and discovering why it doesn't is the fun of the puzzle.