This is the single-player version of the classic Chinese game, played according to the World Mahjong Federation rules. You start out with a ready hand (one tile away from a win) and must find the right tile in the wall to complete it.
The wall is a set of 24 face-down tiles. Click on a tile to pick it. You have three chances per round to find the right tile. The number of picks left is displayed under the wall.
Below the wall is your hand. The space to the right of it holds the last picked tile, and the space just above it holds the discarded tiles. If you picked a tile from the wall and it hasn’t completed your hand, “No hand” will blink and the tile will be discarded automatically. You can also click on the tile to discard it yourself. After that, you can pick another tile. If you’ve picked three tiles and none of them have completed your hand, the round is over.

This is the single-player version of the classic Chinese game, played according to Japanese rules (Tenwa). You start out with 14 tiles, and have to first discard one of them. When choosing the first tile to discard, your goal is to create a ready hand (a hand of 13 tiles which is one tile away from a winning hand). Then you must find the right tile in the wall to complete a winning hand.

Note that you can change your mind about the first discarded tile and take it back by clicking on it (to discard another), but only before you’ve picked the first tile from the wall.
The wall is a set of 24 face-down tiles. Click on a tile to pick it. You have three chances per round to find the right tile. The number of picks left is displayed under the wall.

Below the wall is your hand. The space to the right of it holds the last picked tile, and the space just above it holds the discarded tiles. If you picked a tile from the wall and it hasn’t completed your hand, “No hand” will blink and the tile will be discarded automatically. You can also click on the tile to discard it yourself. After that, you can pick another tile. If you’ve picked three tiles and none of them have completed your hand, the round is over.