Every few rounds, players select a card to unlock new towers (like flamethrowers or mortars) or boost existing ones with damage and range upgrades.

Players choose how to expand the path after each wave, which can lead to long lanes or difficult branching paths.

The game combines classic tower defense with random, procedurally generated map expansion and a card-based upgrade system.

Players earn XP after each run to unlock a skill tree of passive buffs and new tower types that persist in future games. Critical Review Summary