Enemy missiles are raining on your six cities. Tap the sky where you want a counter-missile to burst — the nearest base with ammo fires.
The blast cloud hangs for a moment — any enemy missile that flies into it is destroyed and bursts too, so one good shot can chain a whole cluster.
Each base holds 20 missiles per wave. Watch the smarter waves: some missiles split into three on the way down.
Survive the wave for bonus points per standing city. Lose all six cities and the game is over. A bonus city is earned every 10,000 points.
The arcade classic. Missiles are falling on your six cities and you are the only line of defense. Tap the sky, burst the warheads, chain the blasts.
Just you and the sky — no opponent, no waiting. How many waves can you hold?
Score = your points when the last city falls. The wave you reached rides along.