Planet Defense: UFO

Defend your planet from the alien swarm! Build satellite turrets, unlock permanent upgrades, and survive rotating live events on Mars, Venus and Titan.

Your planet is under attack. Hold the line.

Planet Defense: UFO is a fast, tactile space tower-defense: your home world sits at the center, alien ships swarm in from every direction, and every decision happens in seconds. Tap to build satellite turrets, upgrade your firepower mid-battle, and collect the coins your planet generates — then push one level further.

BUILD YOUR ORBITAL DEFENSE • Tap "+" slots to deploy satellite turrets around your planet • Upgrade 8 combat lines mid-run: damage, fire rate, range, bullet speed, satellite speed, pierce, repair and shields • Every level unlocks more build slots — and brings bigger waves

FIGHT A REAL INVASION • 6 enemy types with their own tricks: swarmers, speeders, tanks, splitters, exploders and turret-hunting shooters • Enemies get tougher with every city — your defense has to evolve • Lose the planet and you restart the city: your permanent progress always survives

GROW STRONGER FOREVER • Earn cores from kills and victories, even when you lose • Spend them on permanent upgrades: starting damage, planet HP, coin boosts and more • Deep upgrade curves reward long-term investment

ROTATING LIVE EVENTS • A new planet needs you every 2 days: defend Mars, Venus and Titan • 5 difficulty tiers from Normal to Nightmare — pick your challenge • Complete event tasks for huge core rewards, then admire your winning defense

PLAY YOUR WAY • Sessions as short as one level or as long as one more city… again • Optional rewarded boosts — no forced ads, no energy system • Fully playable offline; localized in English, Español, Русский, 中文 and Português

Can you hold every city?