- Exchange two puzzle pieces so that each piece is located in the original position.
- When all puzzle pieces are moved in the original positions, the level is cleared.
- The total number of puzzle pieces, and the number of puzzle pieces which are located correctly are displayed in the bottom of the screen.
- Click the Hint button to show a pair of puzzle pieces which should be exchanged, in exchange for penalty time three minutes.
- The user data which includes the best score of each level is stored in your web browser.
- If you use the web browser in the incognito mode or the private mode, the user data won't be stored.
- The user data will be deleted when you click the trash bin button in the level selection screen.
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