This is a portable edition of the solitaire game Shanghai. The game uses traditional Mah Jong tiles. The aim of the game is to match tiles. Four of each type are present on the playing field, and when two tiles are matched, they are removed. When none remain, you win. Only tiles that have an empty space on their left or right may be matched. A wrong move may result in the impossibility to clear the field.

A light story mode is presented in the Shanghai mode; each tile setup is based on a Zodiac animal that needs its power restored. The goal is to complete all twelve stages by restoring each animal's power.

Some variants are also included:
- Kong Kong: Compete against a computer to clear tiles. If you are too slow, extra tiles will be sent over to your side by your opponent. This type of play is similar to games like Puyo Pop. Kong Kong may be played against another player by using a link cable or against a computer.
- Challenge (WonderSwan only): A large Shanghai game that you'll try to race through to get the best score.
- Goldrush: In this mode you will race against an opponent to reach a tile marked 'G'. G is for GOLD, boy! So get cracking.