Fill a 3x3 box with jewels completely in order to remove jewels.
- Drag each piece on the screen right side and place it to the grid.
- If a 3x3 box is filled with jewels completely, those jewels are removed.
- After all three pieces are placed, new three pieces are able to be used.
- The next three pieces are shown at the 'NEXT'.
- If there is no more space for a piece, it's game over.