Finbred is a free browser-based roguelike deck-builder. You draft fish into your deck, draw them into a tank each day, manage ammonia pollution, and try to collect 3 Crown Fish before Day 30.

How do you win in Finbred?

You win by having 3 Crown Fish alive in your tank on the same day before Day 30. Crown Fish cost 30-40 Eggs each, so you need to build an economy engine that scales fast enough to afford them.

Is Finbred free to play?

Yes, Finbred is completely free. It runs in any modern browser with no download, no account, and no microtransactions.

What game modes does Finbred have?

Finbred includes multiple game modes: Rogue-Sea (full roguelike), Draft-Pool (fixed hatchery pool), Seeded-Swim (reproducible runs via seed codes), Daily-Dive (shared daily seed), and Exotic-Reef (challenge scenarios with unique rule modifiers).

What is the Incubator in Finbred?

The Incubator is a mutation mechanic in the Hatchery. You select two parent fish from your Ocean deck to produce a Finbred - a mutant offspring that can inherit traits, roll new yields, and gain a unique visual appearance. Splice different species for a chance at dual-trait combos or same species for boosted yields, but every mutation risks ammonia penalties.

Can I play Finbred on mobile?

Yes, Finbred is fully responsive and works on mobile browsers. It supports touch input and can be added to your home screen as a progressive web app.

FINBRED

A Deck-Builder with fish.

Draft fish. Build combos. Incubate monstrosities. Push your luck. Collect 3 Crown Fish before Day 30 or they all die.

Start a Run >

The Core Loop

Four systems. One 30-day deadline.

Draft

Every fish you buy or splice is a permanent card in your Ocean. Draft smart, thin the fat, or drown in your own decisions. A bloated deck kills runs.

Survive

Pollution is a run-killer. Hit 3/3 ammonia and the tank crashes - zero income that day. Every draw is tension between greed and survival.

Scale

Eggs buy fish. Shells expand your tank. Crown Fish aren't cheap. Build an engine that scales fast, or time runs out and your fish become corpses.

Incubate

Splice fish to create Finbreds with unpredictable results. Inherit yields, traits, and colors. Embrace or Flush your monstrosities.

How a Run Works

Three phases. Every day. 30 days. No shortcuts.

Draw

Draw fish one-by-one from your Ocean into the tank. Maybe it'll be a helpful Pleco. Maybe a Guppy destroys your tank. Push your luck or stop and lock in.

Score

End the day to trigger scoring. Every fish in the tank produces Eggs and Shells. Trait bonuses stack. Crashed tanks earn nothing.

Hatch

The Hatchery opens. Spend Eggs to draft fish. Spend Shells to expand. Mutate a Finbred in the Incubator. Every choice is permanent.

Chain Combos!

The Corpse Economy

Some fish eat fish. Some fish profit from carnage. Stack the right roster and watch chain reactions cause havoc.

Flatfish

Predator

Devours a fish on entry. Leaves a corpse. Earns you +5 Shells for the trouble.

Zombie Worm

Bone Eater

Consumes a corpse on entry. +3 Eggs, +2 Shells. Instant payout from a casualty.

Ghostfish

Haunt

+2 Eggs per corpse in the tank at end-of-day. More bones, more income.

50+ fish. 25+ traits. Hundreds of synergies and combo chains to discover.

Splice & Mutate!

The Incubator

Splice any two fish from your deck for Finbred. What comes out is unpredictable. Rolled yields. Trait inheritance. Mutated appearances. One incubation per day. Choose wisely.

Parent A

Piranha

Shred

2 1

Parent B

Narwhal

Impaler Ivory

3 0

Finbred!

Piranha

Shred Impaler

5 1

Splice species for dual-trait combos or boosted yields. Just don't ask what happens to the ammonia.

A 30-Day Ticking Clock

This is not an idle game. You have exactly 30 days to build an economy that can sustain 3 Crown Fish in the tank on the same day. Buy too early and they dilute your deck. Buy too late and your run might be dead.

DAY 01 / 30

Game Modes

Daily-Dive Rogue-Sea Draft-Pool Seeded-Swim Exotic-Reef