Shanghai II is a game of strategy, memory, and luck. The game consists of a set of 144 tiles which are stacked in a layout. Layouts vary in difficulty. The object is to remove all of the tiles from the layout, one pair at a time. To be removed, the tiles must match and both be "free". A tile is considered free if there is nothing on top of it, and if it can slide out to either the left, right, or both. Shanghai II is Activison's follow-up to their first tile matching game. Players try to remove Mah Jong tiles in pairs from a set pattern. Shanghai II has 8 different tile sets, 12 patterns based on the animals of the Chinese zodiac, and a layout editor for creating patterns.