Build a Base and Steal Tier List (August 2026) — Best Pets, Traps & Gear

By Money Lord — Founder & Editor | Updated: August 19, 2026

The HydraTitan is the rarest pet in the game — the owner's own words on camera on August 15, 2026, not a guess. But rarity isn't the lever most players think it is. A mutation multiplies a pet's earnings by up to 4x, which beats climbing a rarity step, and traits stack on top. Traps and gear below are ranked on the developer's stated order.

All four came from the Roblox API on August 19, 2026 at 16:20 CEST: 7,269 players in game, 81,697,846 visits, 365,393 favourites, 262,610 upvotes against 12,474 downvotes. The all-time peak of 68,157 landed August 8, 2026 at 21:00 UTC, hours before the Traits update, so the game now runs at about a seventh of its ceiling.

S Tier — The Rarest Pets in Build a Base and Steal

S tier is the Ultra rarity, added August 9, 2026 above the OG tier that had been the ceiling since July 25. The developer introduced all three at once: "there's three new ones, too. The mech, the destroyer, and the rarest one, the HydraTitan." Six days later: "everyone knows the HydraTitan is the rarest pet in my game." Two dated statements from the person who wrote the drop tables.

HydraTitan takes the top slot on that alone. On spelling: his captions render it as two words, while players who've pulled one label their clips "HydraTitan". Destroyer and Mech arrived the same day and he never ranked them against each other, so treat their order as unsettled.

Leviathan sits on its own ladder. On August 15, 2026 he called it "the rarest pet from the fishing event, and not a ton of players have it." Fishing runs 10 minutes, stealing is disabled while it's live, and the Void Rod gamepass gives 36x fishing luck by his own store text — verified at 299 Robux on August 19, 2026.

A Tier — The OG Pets, Ranked

OG arrived with the Volcano update on July 25, 2026, and the developer ranked all ten on camera the next day, reading out each pet's earnings with the Inferno mutation applied and naming the last three as "third rarest", "number two" and "the new rarest pet".

The right column divides by three, because Inferno is a 3x multiplier. That gets a real cross-check: a separate creator with 635,000 subscribers filmed a Leprechaun earning 7 million a second, matching our derived base exactly, and independently calls the Gnome the worst OG and the Yeti the best.

B and C Tier — Rebirth Pets Worth Holding

Below OG, pets are gate keys. Each rebirth needs a fixed cash total plus two named pets, and pays permanent luck, +2 max pets, +3 defence blocks, a cash rebate of exactly 10% of the gate, and gear. Max rebirth is 16.

An independent check on the bottom rungs: the developer's store text for the three starter bundles hands out a free Bat, Llama and Elephant pet plus a Dual Coil — rebirth 2, 3, 4 and 3 respectively. Those bundles are no longer for sale as of August 19, 2026. He settled the floor himself on August 15, calling the Dog "one of the worst pets, but it's the first one you get".

Mutations Beat Rarity Steps

A mutation multiplies both sale value and cash per second. Golden to Admin is a 2.67x swing on the same pet, larger than most single steps on the rarity ladder. Pets carry one mutation only.

Two independent outlets confirm those multipliers, one last revised August 5, 2026 — four days before the developer added traits, which is why every published mutation guide is now incomplete.

Traits: the mechanic nobody has covered

The Traits update shipped a Trait Machine. His instructions, filmed August 11, 2026: "place two pets on each side of the machine and use your keys to start it. Each pet will get a unique trait, so they make way more money." Keys are a new currency, and there are eight traits.

Traits stack on top of a mutation, and his August 18, 2026 clip proves it. He found the game's richest player, earning over 300 billion per second, whose best pet was a Cosmic Yeti with every trait, making over 109 billion. A Cosmic Yeti without traits sits at 2x a 10M base, so the traits do that work. We're not naming individual traits: every search for one returns Steal a Brainrot's list instead, and that's contamination, not a source.

Trap Tier List — The Developer's Own Ranking

This is the one part of the game with a real ranking from the person who built it. On July 29, 2026 he posted a top three. Two weeks later he publicly wondered whether he'd got it wrong, and that disagreement is more useful than either verdict alone.

S Tier — Dart Trap and Spike Ball

His number one, verbatim: "the best one is the dart trap. It's the rarest in the game, and if you use enough of them, it can instantly take out the enemy player." Note the condition — one Dart Trap is not an instant kill. Number two was the Spike Ball, "a swinging ball of spikes that batters any intruders. And I always see players in my Discord using this one" — a usage observation from the server he runs, not a power claim.

A Tier — Mine, the community's pick

On August 12, 2026 he opened with "is the mine secretly the best trap?" Then: "everyone knows about the swinging ball and the dart trap. These are the two rarest in the game, but I've seen a ton of players say that the mine is even better. It's a hidden explosive... and it's not even that rare." He never resolved it. We hold it at A because nobody has produced a damage comparison — but if it performs near the Dart Trap while rolling far more often, it's the best defence per unit of cash in the game.

A Tier — Trap Door, B Tier — Tripwire

The Trap Door was third: "it creates a fake floor on the ground that enemies run over and fall through." It removes a raider rather than killing them, which buys time when they have to physically carry a pet back out. The Tripwire was his honourable mention, "super underrated because it alerts you whenever someone is breaking in" — no damage, but in 6-player servers where you're usually off raiding, an alert is worth money. He named all three again on July 27 as what holds a small base together.

C Tier — Spikes and Laser Door

Both are confirmed by his own bundle text, which shipped Spikes in packs of 2 and 12 and the Laser Door one at a time. Neither made his top three.

Best Gear for Raiding and Defending

Gear isn't rolled. It unlocks in a fixed order as you rebirth, which makes it the one ladder here with no ambiguity. The bat line, weakest to strongest: Steel → Stone → Cobalt → Obsidian → Crystal → Golden → Goku → Sky → Galaxy → Rage → Hacker → Demon. The developer: "you need a strong bat to not only break blocks, but also fight off the enemy." It's both entry tool and weapon, so it gates raiding.

S Tier — Invisibility Cloak (rebirth 8). His stated favourite item, August 4, 2026: "if you want to have a successful raid, you need to use my favorite item, the invisibility cloak. You turn completely invisible for over 10 seconds, which allows for some sneaky repositioning whenever someone catches you breaking in their base." Getting in is the easy half of a raid; the cloak solves the hard half.

A Tier — Grapple Hook (rebirth 4) and Sniper Rifle. On August 6, 2026 he named exactly three items as the fastest route to a rich base: "you can use a grappling hook, the invisibility cloak, and even a sniper rifle to help." The Grapple Hook is the earliest strong unlock, and it's traversal — your escape route matters more than your entry point here.

B and C Tier — potions and coils. The Shrink Potion (rebirth 7) and Body Swap Potion (rebirth 9) get a nod: potions are "super underrated because they can make you super tiny and even make you massive." The coils at rebirths 1, 2 and 3 are pure movement; Bear Trap (5) and Juggernaut (6) fill the middle. Rebirth 11 pays the Ban Hammer. Past that the ladders diverge, so while the Flashbang, TNT, Magnet and Sniper Rifle are all real, we won't print rebirth numbers we can't stand behind.

Tier List Summary Table

How We Ranked These

Pets are ranked ordinally, on the developer's stated rarity order and mutation maths. There is deliberately no per-pet income table, because pets are levelled with cash and realised earnings are unbounded. One creator took a single Admin Mapinguari from a 45M base to 681M a second in one sitting, and his whole base from 11 billion to 50 billion. Any income column would be that player's spending, not the pet.

Traps and gear are ranked on the developer's own dated statements, and where he contradicted himself we show both sides. Live figures came from the Roblox games, votes, favourites and game-passes APIs on August 19, 2026, with liveness confirmed by a redirect test on placeId 132016691802922. The game has zero badges, so there's no difficulty signal there either.

Three omissions on purpose. Drop rates: every "1 in X" in circulation is luck-adjusted, not a base rate, because luck stacks from a cash upgrade, gamepasses, rebirths, code boosts and dev-run global multipliers. Clan mechanics: nothing has been published. The full rarity ladder: the only partial one we found came from a creator audibly unsure of his own middle ordering.

For working codes, our Build a Base and Steal codes page owns that beat. The hub collects everything else, our Robux guide covers funding the luck gamepasses, and Build a Base RNG vs Build a Base and Steal sorts out the two similarly-named games people keep confusing.

More Build a Base and Steal Guides

• Build a Base and Steal hub — every guide in one place.
• Build a Base and Steal codes — the current working list.
• Build a Base and Steal free Robux guide — funding the luck gamepasses.
• Build a Base RNG vs Build a Base and Steal — two different games, compared.
• Build a Base RNG — the other base-building roller.
• Build a Base RNG codes — that game's separate list.
• Steal a Brainrot — source of most trait confusion.
• Steal an Egg — another base-and-steal hybrid.
• Grow a Garden — where the mutation format came from.

Frequently Asked Questions