The rules

Play rotates counterclockwise. On each player's turn, they draw one tile from the wall, then discard any tile from their rack (the stand that holds a player's tiles), including the one they just drew. Your hand never grows or shrinks, so each time you pick up a tile, you're also discarding one.

The wall gets smaller every time someone draws, and it never replenishes. When it's empty, the hand ends (even if no one has won).