Crossfire Keep: Tower Defense

Tower defense you fight in. Build turrets and traps on the roads, then pick up a rifle and hold the line beside them, against a machine army that crossed a thousand years to steal tomorrow.

THE HEART MUST NOT FALL
Long ago a dying star fell to Earth and took root on a green hill: the Heart, a crystal of living light that remembers tomorrow. A thousand years later it lights Lumen, the last city of humankind.

The Iron Dominion, a machine mind, wants the Heart to remember its future instead. It couldn't break Lumen's walls, so it tore a wormhole back to the age when the Heart was guarded by one old stone keep. Take the Heart then, and Lumen never happens.

Lumen could send one soldier through. You.

BUILD THE KILL ZONE
Every machine you break feeds the Heart, and the Heart turns that power into guns and walls. Lay down 24 turrets and 12 traps where the roads braid, cross and split. Every build has its own job and energy is tight, so placement is everything: find the choke point, cover the gaps, catch the flyers.
• Mix the elements. Soak a column with a Water Cannon, then hit it with a Tesla Coil and watch the surge arc down the line. Freeze a brute solid with the Frost Ballista, then shatter it with a blast.
• Spike Traps, Land Mines, Saw Blades and Black Ice for the road, and a Chrono Field that holds them in stasis.
• Take every turret and trap from Rookie to Legend. On Hard, awaken each build down one of two paths.

THEN STEP INTO IT
• 13 guns the Heart remembers from the last great war, from the Assault Rifle and a 12-gauge Shotgun to the Minigun, the Railgun, the Flame Projector, a Javelin that locks on to giants and dives onto their heads, and a Stinger that locks on to flyers.
• Earn four parts for every gun and see each one fitted. Hard adds a Mk II of every gun.
• Call down the keep's firepower: air strikes, artillery, drones and, when they overrun you, the Missile Silo.
• Fight from the battlements, then leap off and open your parachute.

THE RELIC HOST
Nothing made survives the wormhole whole. The Dominion's machines come through burned down to their glowing cores and rise again in bronze, iron and carved stone. They pour out of every gate in columns, swarms and air raids: Menders that heal, Aegis Wardens that shield, Drill Moles that tunnel under the road. The biggest come last.

THEY LEARN WAR
On Normal and Hard, the machines shoot back. Fire teams take cover and pin you down. Deadeyes snipe from hiding: follow the laser or catch the glint of the scope. Boarders land on your roof. Duck behind walls and bunkers, pop up and shoot back. On Hard, the Dominion studies your defense and sends the next wave at its gaps, and Jammers shut your builds down.

THE HEART RUNS. THEY FOLLOW.
When the machines come too close, the Heart folds the keep away to a new place and a new age. 90 levels in 18 worlds, across three campaigns:
• Easy: the first of the Host marches through the gates, not yet armed. Pure tower defense.
• Normal, the Siege: the Dominion learns war, from the iron frontier to a night that won't end and the citadel's last wall.
• Hard, the Bastion: the Dominion adapts, and drives the Heart to jungle temples, storm coasts and salt flats.
Every world ends with a giant or a boss: the Siege Colossus, the Sky Dreadnought, Titan Prime and more. Seren, the voice of the Heart, guides you through it all.

ONE SIEGE A DAY, THE SAME FOR EVERYONE
Each day's Challenge Siege gives every player the same map, the same waves and the same kit. No upgrades, nothing bought: just your plan and your aim, on the daily leaderboard.

A REASON TO COME BACK
• Rank up your Commander through four skill trees, with keystones like Bullet Time.
• Spend stars on permanent Keep Upgrades.
• Daily missions, level challenges, 50 Game Center medals and leaderboards.