Place mahjong tiles on the board as towers. Meld them into Runs, Pungs and Kongs to upgrade what they shoot, and hold the line as tide beasts push in along the shore road.
Escalating waves, bosses, an economy to manage, and roguelite powers that make every run different.
Both modes share one Meldscore, one achievements shelf and one city map. Hold a city in Coast and Siege unlocks a matching tower skin. Defeat a boss in Siege and Coast gains a shield boost. Hold all five coasts across both modes to earn the real science report and the Keeper's certificate.