zulabet
There are some hands, like 2024 or NEWS, where jokers are forbidden. These hands are considered singles since each tile is different. In these cases, drawing the tile or switching a blank is the only way to complete the hand.
The goal of mahjong is similar to poker, in that the aim is to make matching sets and pairs. A set is three or four identical tiles or three consecutive tiles (also known as 'melds'), and a pair is two of the same tiles (often called 'eyes'). To win mahjong a player must form four sets and one pair.