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Tower Defense is a short six-wave hold. You buy Arrow, Cannon, or Frost and plant them on empty cells beside the road — not on the path itself. Start a wave when you are ready. Arrow is the cheap regular shot. Cannon hits harder. Frost slows. Coins from kills buy the next tower. Eight leaks lose the keep. Survive all six waves to finish.
Tap a tower type, tap a valid cell, then tap Next wave.
Survive six waves. Eight leaks lose the keep. Coins from kills buy more towers.