Click a tile to flip a pattern. Patterns change as levels rise, but every level is
guaranteed solvable because each board is generated from a solved state.
ON Pattern tiersECHO = Cross + DiagonalsUNST = Cross + KnightsDEAD = Not clickable
Dead tiles can’t be clicked, but they can still be toggled by other patterns —
this keeps the puzzles fair and solvable.
