Thunder Mosaic

Thunder Mosaic - a sliding tile puzzle played on a three by three board. A single picture is cut into nine pieces, eight of them sit inside the frame and one cell of the board stays empty. At the start of every round the pieces are mixed by a chain of legal slides, so the layout always stays solvable. A tap on a piece that touches the empty cell moves it into that gap, and a piece that does not touch the gap cannot be moved at all. Each slide adds one to the move counter shown above the board, while a tap on a piece that cannot move only shakes the frame. The round has no timer and no failure state: it runs until every piece is back in its original place, after which a summary panel shows how many moves the round took and offers to start over or to leave to the menu. The lowest move count is kept as the best result and is shown next to the move counter during play. A pause button sits above the board and freezes the round together with its animations, with options to continue, to start over or to return to the menu. The menu holds a list of achievements that open up as rounds are completed, tied to the number of finished rounds, the number of started rounds and the lowest move count reached so far. Settings hold a vibration toggle for slide feedback, a toggle for the flash and shake effects on the board, a reset for the best result and a clear option for the whole progress. Best result, finished rounds and achievement states are saved on the device and stay between launches. The game runs offline in portrait orientation and needs no account.