Steal Fish Eggs Endless Pool Upgrades: Costs and What Changes

Upgrading the tread pool — the endless-pool training station in Steal Fish Eggs — is a purchase you make at the pool itself, separate from training on it. Two reported examples put an upgrade at $20,000 in cash in one session and at a billion dollars or 299 Robux late in another (for a player who already owned the best trail and max speed multipliers). The upgrade path is repeatable and has a maximum level.

Upgrading vs. training on the tread pool

The tread pool (players sometimes first call it a treadmill before correcting themselves) is a station where you can swim in place to build speed. Two different interactions happen there:

• Training means getting on the pool and swimming in place to raise your swim speed.
• Upgrading means paying to improve the pool itself — players describe it as choosing to "upgrade" the treadmill/tread pool.

Both matter for progression, but they are not the same action: one spends money on the station, the other spends time on it. Our swim training guide covers the training side in detail.

What upgrades cost

There is no known fixed price schedule. Two reported examples from gameplay sessions:

Keep these limits in mind:

• These are two reported examples, not a verified full price schedule. Don't read them as a growth curve.
• Neither example shows a named pool level, so you can't map a specific price to a specific tier.
• The late-game price is a choice between in-game cash and Robux — one player in that session bought it with Robux because they didn't have the billion dollars.

The upgrade path has a maximum level

You can upgrade the pool multiple times in a row, and players do reach a "max level swimming pool." So the upgrade path is repeatable with an endpoint — the exact maximum level number isn't known, but the pool is not endlessly upgradeable.

What an upgrade actually changes

What is visibly known after upgrading:

• The upgraded pool displays money on it, and at max level the pool looks visibly different — players react to how impressive it looks.
• Player speed totals climb sharply in the same sessions, and players treat the max-level pool as what finally lets them reach the game's farthest, speed-gated zones.

The honest qualification: those sessions combined pool upgrades with active training, trail purchases, and bought speed multipliers all at once, so the exact per-upgrade speed effect isn't known. The safe reading is that upgrading the tread pool is part of the endgame speed push — players buy it when they've exhausted trails and multipliers and still need more speed for the farthest zones — while training on the pool is what converts that setup into actual speed gains.

Where the pool upgrade fits in your progression

1. Mid-game, keep training and stealing eggs to build your cash; egg stealing and hatching feed both your income and your collection.
2. Late game, once you own the best trail and max speed multipliers, the tread pool is described as one of the last things left to upgrade in the entire game — at that point it's reported to cost a billion dollars or 299 Robux, and players buy it for the push into the highest speed-gated zones.

For the bigger picture of where this sits among tanks, trails and zones, see the full progression guide.

Bottom line: upgrading the tread pool is a repeatable purchase with a max level, separate from training on the pool. The two known reported prices are $20,000 in cash in one session and a billion dollars or 299 Robux late in another — not a full price schedule — and its exact per-level speed effect isn't known, but players reach for it at the endgame when they need maximum speed for the game's farthest zones.