MUTARIUM: Mutant Aquarium Defense CD Key
PC price comparison · Lativille · Nov 12, 2026
Feed them and they mutate. Overfeed them and they turn on you. Mix MEAT, GLOW and ORE to grow your fish into adorable little horrors, then let them fight the failed experiments breaking into your tank. You never control a unit — what you feed is the whole strategy.
Lowest final price
at Steam · Standard Official
Historical low: $8.99 on November 13, 2026
Get the best deal ↗Compare MUTARIUM: Mutant Aquarium Defense key prices
Sorted by final price including fees, never by commission.
| Store | Edition | Activates on | Region | Price | Fees | Final price | |
|---|---|---|---|---|---|---|---|
SteamOfficial | Standard | Steam | Global | −10%$8.99 | none | $8.99 | Go to store ↗ |
- SteamOfficial
Standard · Steam · Global
$8.99 · fees: noneGo to store ↗$8.99
MUTARIUM: Mutant Aquarium Defense price history
Historical lows by store
- Steam$8.99
About MUTARIUM: Mutant Aquarium Defense
What you feed is your build. MUTARIUM is a feed-and-defend roguelite. You run a lab aquarium full of specimens that mutate based on what you feed them — and the lab's failed experiments keep breaking in to eat everything you've grown. You never command your fish. You feed them, they fight. Every pellet is a build decision. Three feeds, one build — MEAT makes killers, GLOW makes earners, ORE makes walls. The mix decides each fish's mutation branch: pure lines, hybrids, and a KING rank for those who push their luck. Read the forecast, change the diet — every wave is announced before it hits. Chargers punish your shots, spitters hit from outside your tank line, splitters punish your finishers. Your counter-pick is what you feed next. Overfeeding is real — max out a specimen and keep stuffing it, and it goes berserk. Your best fish becomes the invader. You made it; now deal with it. Bosses drop sealed specimen eggs — hatch them to unlock new species (Guppy, Veiltail, Ironjaw, and one still sealed), each with its own mutation tree and a codex to fill. Short runs, long descent — a run is one dive through the facility: the Isolation Tank, the Deep Vats… and four sealed floors below. The elevator keeps going down. Heads-up on tone: mutation is cartoon body horror. Specimens visibly deform and grow clustered eyes as they advance. No gore, no realistic injury. Insaniquarium invented the feed-and-defend aquarium in 2001, and nothing has carried it forward since. MUTARIUM is a love letter to that genre — rebuilt as a roguelite, where the feeding itself is the build. The game sends anonymous progress counts (e.g. “chapter cleared”) to help balance it — no account, no personal data, no IP stored. You can turn this off in Options › Anonymous stats.Read more
MUTARIUM: Mutant Aquarium Defense system requirements
Minimum
- OS: Windows 10 (64-bit)
- Processor: Dual-core 2.0 GHz
- Memory: 2 GB RAM
- Graphics: OpenGL 3.3 compatible GPU (integrated graphics supported)
- Storage: 500 MB available space
MUTARIUM: Mutant Aquarium Defense key FAQ
+What is a MUTARIUM: Mutant Aquarium Defense CD key?
A MUTARIUM: Mutant Aquarium Defense CD key is a digital code that unlocks the game on a PC platform such as Steam. After redeeming it, you download the game directly from that platform and it stays in your library.
+What is the cheapest price for MUTARIUM: Mutant Aquarium Defense?
The cheapest MUTARIUM: Mutant Aquarium Defense key right now costs $8.99 at Steam, 10% off the regular price. We compare 1 offers from 1 store, and the price already includes payment and service fees.
+What is the historical low for MUTARIUM: Mutant Aquarium Defense?
The lowest price we have recorded for MUTARIUM: Mutant Aquarium Defense is $8.99 on November 13, 2026. Check the price history chart to decide whether to buy now or wait for the next sale.
+Is it safe to buy a MUTARIUM: Mutant Aquarium Defense key?
Buying from an official store such as Steam, GOG or Epic Games is always safe. Key resellers are often cheaper but sell keys second-hand, so check the region lock and buyer protection before you buy. Every offer on GameKeyDeal is labelled as official or reseller.
