Defend the shield at the end of the road for 20 waves. Boss enemies arrive every fifth wave.
1 · Deploy defenders
Tap a defender, then tap an open part of the map. On desktop you can also drag.
2 · Start each wave
Press START LEVEL when your defenses are ready.
3 · Upgrade
Tap a placed defender to upgrade, move or sell it.
4 · Watch the road
You cannot place defenders on the enemy route or too close to another defender.
Boss waves
Bosses arrive on waves 5, 10, 15 and 20. Build up before they reach you.
Defender effects
Some defenders slow, stun, burn, splash or bounce damage onto nearby enemies.