Tiles is a single-player game in which you play against the computer. It is very similar to Rummikub, but there are no wild tiles and no initial meld requirement.
The object is to get rid of all the tiles on your rack by forming sets and runs on the board. A set is 3 or 4 tiles with the same number and different colors. A run is 3 or more tiles with consecutive numbers and the same color.
You may use tiles from your rack to create new sets and runs, or add to existing sets and runs. You may re-arrange tiles on the board to create opportunities for adding your tiles. At the end of your move, the board must contain only valid sets and runs.
When you are done adding tiles to the board, click 'Move Done'. If you cannot add any tiles to the board, click 'Draw Tile' and your turn is over.