Goal: Protect your Keep (the teal citadel on the right). Survive 10 waves of siege engines — then hold endless.
Build phase: Pick a material (wood/stone/iron) and a tool, then click on the canvas to place. Blocks are rigid bodies — gravity, stacking, and impact all behave like real physics.
Physics: Walls don't have hit-points — they have integrity. Big impacts (cannonballs, sapper blasts, falling debris, ram charges) damage them; remove the support beneath a tower and the whole thing comes down. Debris from broken blocks falls and can crush enemies — or your own walls.
Tools: R rotate S toggle snap Use the Remove tool to clear misplaced blocks (no refund after combat starts).
Enemies: Ram (pushes walls), Catapult (lobs stones), Sapper (explodes), Cavalry (fast raider), Warlord (boss, every 5th wave). Reach the Keep and they damage it directly.
Economy: Earn gold per kill and per wave cleared. Spend on blocks, repairs, and permanent upgrades. Repair patch-damages blocks back toward full integrity.