Waves of balloons are floating along the path. Build towers next to it to pop them before they escape! Popping balloons earns money for more towers and upgrades. Survive 40 rounds to win the map.
Survive 40 rounds to unlock the next map. Win on Easy for 1 star, Normal for 2 and Hard for 3.
Pick a tower from the left side, then tap a grass square to build it. Tap a tower to upgrade it, change who it aims at, or sell it. Each tower has two upgrade paths, and only one can go all the way to tier 3. Metal balloons shrug off sharp darts, so use bombs, zaps or a powered-up Owl. Camo balloons can only be seen by the Owl Scout, a Frog with Frog Eyes or a Zapbot with Crystal Eye. A boss blimp arrives every 10 rounds! Your run saves between rounds. Your highest round goes on the leaderboard.