Shisen slowly is a puzzle game similar to mahjong. To match two like tiles, they must be able to be connected by no more than three vertical and/or horizontal lines. Lines can be drawn within or outside of the array of tiles, but may not pass through any other tiles.
You decide the goals of the game:
Do you want to draw the least lines possible, or the most?
... the longest lines, or the shortest?
... the fewest external moves, or the most?
... are doubles desirable or not, and, if so, do you want a long series of them?
... or maybe you just want to end up with a drawing that pleases you!
The number of like tiles, and the number of types of tiles are options you can set as you please.
If you run out of moves (or just feel like it) you can always cheat.