Jade Bastion Guard is a free Android game that combines classic mahjong with strategy elements. Players engage in building defensive layouts using mahjong tiles that represent various defensive structures such as walls, towers, archers, cannons, and shields. The game features an engaging build phase where players must strategically place their tiles to create a formidable bastion capable of withstanding enemy assaults.

Once the bastion is built, players must defend against waves of enemies across 11 levels that increase in difficulty, from basic militia to challenging legendary warlords. This game emphasizes strategic foresight and efficient formation design, offering a unique twist on traditional mahjong gameplay within a richly themed military context.