Why do some places play 18 fast?

Because the number of players is different.

1, track two people quickly: use a complete deck of playing cards except the king and the king. Each player draws 18 cards, and the remaining cards are placed on the table, so as not to participate in this game.

2, three people run fast: a deck of poker removes a 2 and a king, and each player touches 17 cards.

3, four-person run: use a complete deck of playing cards, except the big and small kings, each player touches 13 cards.