PRISM DEFENSE
Draw. Merge. Defend.
You never know which tower comes next. Draw, merge, and see how many waves you can hold.
In three seconds
01
Draw
Spend gold to summon a random tower on a random slot.
02
Merge
Drag two identical towers together for one tier up. Type rerolled.
03
Defend
Stop the enemies looping your track. Every escape costs a life.
Features
The merge gamble
Merging two identical towers makes a stronger one, of a random type, every time. Every merge is a risk-reward decision.
Endless waves
Enemy HP scales exponentially and a boss arrives every fifth wave, paying bonus gold at HP milestones and summoning escorts at half health.
Counter enemies
A healer that restores the pack, a splitter that leaves two children behind, and a shield that blocks hits rather than damage. Each debuts on its own wave.
Set strategies
Point every Laser, Cannon, Frost, Sniper, or Volt at FIRST, STRONG, or HEALER as a group. Cut the healers first, or stop the leader. Your call.
Economy decisions
Draw costs escalate, stuck towers sell for a refund, slots differ in track coverage, and calling the next wave early pays gold that scales with the risk.
Daily challenge
One shared seed for every player in the world, every day. Beat today's record.
Achievements
Wave 10 lands inside an ordinary first run. Wave 30, a tier 7 tower, and finishing without ever selling do not. The ladder reaches below and above.
Palettes
Earn Prisms through play and achievements to unlock palettes one by one. Or get all six with Prism Premium.
5 towers × 7 tiers
Glowing vector polygons. Each rules the track its own way.
Laser
Rapid beams at the front-runner.
Cannon
Slow shells with splash damage.
Frost
Chills the target and nearby enemies, slowing them.
Sniper
Reaches anywhere on the board, for heavy damage.
Volt
Lightning that chains between enemies.
Palettes
Give your towers a new look. Enemies keep their colours, so healers, splitters, and shields stay easy to recognize.
Prism
Aurora
Ember
Abyss
Graphite
Obsidian
Prism Premium
Every palette. One purchase.
From Prism to Obsidian, enjoy all six palettes for life. Tower power and game difficulty stay the same.
- Lifetime access
- Pay once. No subscription.
- Restore your purchase
- Use the store account you purchased with to restore from the in-app palette screen.
- No interstitials
- When ads are available, Premium keeps forced interstitials off. Rewarded revives and double Prisms remain optional.
You can still unlock palettes one by one with Prisms earned through play, without buying Premium.
Check the in-app palette screen for availability and your local price.
Screenshots
Out now on iOS and Android
Free on the App Store and Google Play.