Your goal is simple: stop the monsters before they break through your gate.
Each round, spend battle resources to deploy units into the lane. Cheap units like the Swordsman hold the front; ranged units like the Archer deal damage from safety. Every unit has a cost, HP, damage and traits — see the unit list.
The incoming bar shows which monsters are coming. Armored tanks shrug off chip damage, flyers ignore most melee, and some monsters split or explode on death. Check the bestiary and counter accordingly.
Between battles, place and upgrade buildings: the Keep raises your unit cap and gate HP, military buildings upgrade your troops, and economy buildings grow your gold. Research unlocks new units and abilities.
Recruit heroes and trigger their abilities at the right moment — a well-timed stun, heal or ultimate turns a losing wave around.
Clear a round to earn gold and advance. Each tier gets tougher, so keep upgrading units, buildings and heroes between fights.