
Prism Bastion
Prism fusion tower defense
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Free
In-App Purchases
Rating summary
About
The Void is eating the last floating bastion. You are the Prism Warden, and the Core is yours to hold.
PRISM BASTION is a 3D tower defense game built around one idea: colour is the mechanic. Your towers are not just damage numbers - each one emits Ember, Frost or Volt light, and the real power lives where those colours meet.
THE PRISM FUSION SYSTEM
Hit a single enemy with two different colours and the light fuses:
- Ember + Frost = Steamburst: a wide area blast that clears a pack
- Frost + Volt = Superconduct: tears armour open and chains to nearby foes
- Volt + Ember = Overload: a heavy burn that knocks enemies back down the path
- All three = Prism Break: massive damage and a field-wide stun
The Prism Node support tower counts as every colour for its six neighbours. Place one well and your whole line changes character. Tower placement stops being a range puzzle and becomes a colour-adjacency puzzle.
WHAT YOU ARE UP AGAINST
- 6 towers, 3 levels each: the fast-burning Ember Turret, the slowing armour-shredding Frost Spire, the chaining Volt Coil, the line-piercing Lance Array, the shockwave Pulse Bloom, and the Prism Node that changes everything
- 10 enemy archetypes: heavily armoured Bulwarks, Phasers that go untargetable on a cycle, Drifters that fly straight to the Core ignoring the path entirely, Leeches that steal your energy on arrival, and two bosses - a Void Warden that shields itself and heals its escort, and a Colossus that splits into swarms every time you break it
- 3 abilities: Orbital Lance, Stasis Field, Core Overcharge
- 12 Prism Boons, offered every third wave, so no two runs build the same way
CONTENT
- 5 sectors: the Causeway, the Abyss, the Fracture, the Ring and the Lattice - from a single lane to four rifts pouring in at once
- 3 difficulties: Standard, Hard, Nightmare
- 20 waves per sector, then Endless mode for the score chase
- Full tutorial, in-game Bestiary and Tower Codex, next-wave preview
- Traditional Chinese and English, switchable at any time
- Accessibility: element shape markers for colour-blind play, reduce motion, always-on range rings
- 1x / 2x / 3x speed control
BEFORE YOU COMMIT
Tapping a tower shows its full stats, its special effect, and which fusion it would enable with the towers already beside that tile, plus a translucent preview on the board. Nothing is spent until you confirm.
ABOUT THIS GAME
Every mesh, every material, every sound effect and every note of the score is computed on your device at runtime - there is not a single texture or audio file in the app. That is why it is tiny, why core gameplay works offline, and why the light on the island never looks quite the same twice.
FREE TO TRY
Sectors 1 and 2 are free and complete - a full 40 waves with every tower, every enemy, every boon, the whole Bestiary and Tower Codex, the tutorial and every accessibility option. One optional purchase unlocks sectors 3, 4 and 5, the Hard and Nightmare difficulties, and Endless mode. That is the only thing there is to buy - no ads, no subscription, no currency, no loot boxes.
Core gameplay works offline - No ads - No cross-app tracking - No subscription
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What's New in Prism Bastion
1.0.1
September 8, 2026
Improved purchase and restore messages, keyboard navigation, and layouts on smaller screens. Fixed an issue where retrying after a timeout could incorrectly report that a purchase had failed.
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In-App Purchases
$2.99
Full Version Unlock
All 5 sectors, Hard and Nightmare, and Endless mode.





