Build a maze. Enemies walk from the left gate to the right gate along the shortest open path. Every tower you place is a wall, so shape a long winding route and line it with firepower.

Place: tap a tower in the palette, then tap a cell. The ghost shows range and the dotted line shows the new enemy path. You can never fully block the path.

Tap a tower to upgrade, sell (70% back), or change targeting.

Waves come on a countdown, or send early for bonus money. They can overlap. Every 50th wave brings a boss.

Combos: kills within 1.2 s of each other build a multiplier up to ×5. Fast, efficient kills score far more than slow ones.

Flyers ignore your maze and fly straight across. Only some towers can hit them (marked ✈ in the palette).

Your run is saved automatically if you close or background the app.