Shanghai II , a puzzle game variant also known as solitaire mahjong, challenges players to remove pairs of matching tiles without adjacent tiles from both sides. The goal is to clear the board by rearranging 144 mahjong tiles in various patterns. The game features six animal-themed patterns: tiger, scorpion, monkey, snake, panther, and dragon.
Gameplay involves strategically removing tiles that match, with options for displaying hints or reversing moves. A time-limited mode is also available, adding an extra layer of challenge to the game.