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Build a Base and Steal Guide
Pets

Pets and Rewards

The documented item systems: every named pet, all four mutation multipliers, the pet Index, code rewards, and the gear inventory.

Checked 2026-10-06Sourced tables

Pets: the documented roster

Pets are the game's items, income, and victory condition at once. Every pet earns Cash per second, and the official description's promise of earnings while you are away applies to the whole placed roster.

The published rebirth table names 30 pet entries across the 16 tiers: Cat, Chicken, Bunny, Bat, Owl, Llama, Zebra, Elephant, Lion, Stegosaurus, YiQi, Mammoth, Velociraptor, Azhdarchid, Gargoyle Bat, Cockatrice, Sphinx, Pegasus, Roc, Hydra, Qilin, Simurgh, Dragon, Unicorn, Golden Kitsune, Gold Unicorn, Gold Dragon, Gnome, Fairy, and Mermaid.

Pro Game Guides counts the ladder as 29 different pets including Fish-type pets and Golden-mutation variants - the one-entry difference comes from Gold Unicorn, Gold Dragon, and Golden Kitsune being mutation variants of base species rather than separate animals.

Mutations: the reward multipliers

Mutations are the game's quality system. The Sportskeeda table published August 5, 2026 documents four: Golden (1.5x income and sale value, Pet Rolls only), Cosmic (2x, from the Cosmic Invasion event where a spaceship abducts base pets and returns them changed), Inferno (3x, from the Volcano event with a small chance to mutate in-place pets), and Admin (4x, only during developer-run Admin Abuse windows).

Two rules shape strategy: a pet holds a single mutation, and mutations cannot be transferred between pets. Mutated duplicates are therefore sellers, while mutated core earners stay placed - both income and sale value scale with the multiplier.

The mutation system arrived in public documentation during August 2026: a Reddit discovery post on August 4 pointed at a community guide, and Sportskeeda's full table followed on August 5.

Reference

Mutations and the pet roster

The two tables most item questions come back to.

All four documented mutations
MutationMultiplierHow obtainedNotes
Golden1.5x income and sale valuePet Rolls onlyNo event requirement; roll luck decides when a Golden appears.
Cosmic2x income and sale valueCosmic Invasion eventA spaceship abducts pets from your base and returns them mutated.
Inferno3x income and sale valueVolcano eventThe event spawns a volcano, and pets in your base have a small chance to return mutated.
Admin4x income and sale valueAdmin Abuse events onlyDeveloper-run windows announced after updates; the community Discord tracks them.

Source: Sportskeeda mutations guide (2026-08-05). Checked 2026-10-06.

Species named in the published rebirth requirements
Named petsCount
Cat, Chicken, Bunny, Bat, Owl, Llama, Zebra, Elephant, Lion, Stegosaurus, YiQi, Mammoth, Velociraptor, Azhdarchid, Gargoyle Bat, Cockatrice, Sphinx, Pegasus, Roc, Hydra, Qilin, Simurgh, Dragon, Unicorn, Golden Kitsune, Gold Unicorn, Gold Dragon, Gnome, Fairy, Mermaid30 entries (29 unique species per Pro Game Guides)

Source: Sportskeeda rebirth table + Pro Game Guides pet-count summary. Checked 2026-10-06.

The pet Index and permanent bonuses

The pet Index pays permanent Luck and Cash boosts as the collection grows, per the Sportskeeda economy notes. That makes every first-of-a-species catch valuable beyond its income line, and it gives duplicate-adjacent rolls a collection purpose.

The Index reward stacks with the other permanent systems - rebirth Luck (2x to 208x) and pet slots (+2 per tier) - so long-term accounts compound several permanent multipliers at once.

Code rewards: Luck boosts

Every documented code reward is a temporary Luck boost: UPDATE and VOLCANOO at +4 Luck for 10 minutes, WeHit30K and Happy30K at +2 Luck (10 minutes per GameRant; the fan wiki logged 5-10 minutes for WeHit30K). Luck improves roll outcomes, which is why codes chain into roll sessions.

The code system itself is young: the game launched without one, and redemption arrived with the mid-July 2026 [UPD] patch. Codes retire at the biweekly Saturday event rhythm, so treat any list older than two weeks as historical.

Rewards land through the Shop panel (both trackers describe it slightly differently - GameRant says Shop icon on the left with a Redeem box; the fan wiki points at the right-side Shop menu behind the NPC counter), and codes are case-sensitive.

Gear as inventory

Gear items are the reward side of the rebirth ladder: 26 documented tools from Steel Bat and Speed Coil at tier 1 through Ban Hammer and Flashbang at tier 15 to Demon Bat, TNT, Magnet, and Sniper Rifle at tier 16.

They divide into damage lines (bats), mobility (coils, Grapple Hook), utility and trick items (Shrink Potion, Body Swap Potion, Invisibility Cloak), defense (Bear Trap, Juggernaut), and endgame raid tools (TNT, Magnet, Sniper Rifle).

No gear prices or damage numbers appear in a creator-owned source; the tier at which each tool unlocks is the documented stat that matters.

Code rewards

The dated code log

Every documented code reward is a Luck boost.

Code strings, rewards, and check dates
CodeRewardStatusFirst reported
UPDATE+4 Luck for 10 minutesReported activeAugust 16, 2026 (GameRant)
VOLCANOO+4 Luck for 10 minutesVerified in-game by the fan wiki on 2026-07-28late July 2026
WeHit30K+2 Luck (10 minutes per GameRant; 5-10 minutes per the fan wiki)Verified in-game by the fan wiki on 2026-07-25July 2026
Happy30K+2 Luck for 10 minutesVerified in-game by the fan wiki on 2026-07-25July 2026
Happy30KCopyrejects with an invalid-code messageBroken variantJuly 2026
WeHit30KCopyrejects with an invalid-code messageBroken variantJuly 2026
RADIOACTIVE+2 Luck for 5 minutesReported by two independent trackers at the Sep 28, 2026 recheckAugust 2026, around the Clans update window

Source: GameRant (2026-08-16) + build-a-base-and-steals.wiki (2026-07-31). Checked 2026-10-06.

FAQ

Item and reward questions

What do pets do in Build a Base and Steal?

Every pet earns Cash per second, fills rebirth requirements, and can be sold. Mutated pets multiply both income and sale value (1.5x to 4x per the documented table).

How many pets are in the game?

The rebirth table names 30 entries across 16 tiers; Pro Game Guides counts 29 unique species once Golden variants are tallied separately. A fuller live roster is updated in-game.

What is the rarest mutation?

Admin at 4x - it only appears during developer-run Admin Abuse windows. Inferno (3x) and Cosmic (2x) come from the Volcano and Cosmic Invasion events, and Golden (1.5x) comes from rolls.

What rewards do codes give?

All documented code rewards are Luck boosts (+2 to +4 for 5-10 minutes) that improve pet-roll odds; redemption runs through the Shop panel and codes are case-sensitive.

What is the pet Index?

A collection tracker that pays permanent Luck and Cash boosts as you collect more species, stacking with rebirth rewards.

Next checks

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