Germ Goop is a Rat Hole Reels slot on Stake Engine with 96.00% RTP and a 25,000× max win. Play the Germ Goop demo free above with play money — no deposit and no account needed. It has 8 ways to play, from the base game up to megaspins at 300× your bet, and each one's exact odds are broken down below. For real money, Germ Goop is available at Stake.
Every way to play
8 modes · tap one to explore its odds
Cheapest route to the 25,000× max: Megaspins (300×) — about 2.5M× your bet staked per hit on average, vs 2.5M× on stickystrain (15×).
Base game
Base game · 1× your bet per spin · A normal spin at 1× your bet.
Odds explorer
Pick a payout and read the exact chance, straight from Engine's provably-fair outcome table.
Demos use play money. Maths computed by circus.fyi from Engine's published provably-fair tables — every outcome a mode can produce and how often, nothing sampled.
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Germ Goop demo — questions
- Can I play the Germ Goop demo for free?
- Yes. The Germ Goop demo on circus.fyi runs the real game from Stake Engine with play money, so you can try every feature without a deposit or an account.
- What is the RTP of Germ Goop?
- Germ Goop has an RTP of 96.00%, which means it pays back that share of every amount staked over the long run.
- What is the max win on Germ Goop?
- The max win on Germ Goop is 25,000× your bet. The most likely way to land it is Megaspins (300× per round), where it hits about 1 in 8,333 rounds.
- Does Germ Goop have a bonus buy?
- Yes — Germ Goop has 5 buy options: Viralsurge at 25× your bet; Stickystrain at 15× your bet; Free spins at 100× your bet; Megaspins at 300× your bet; Mixer at 200× your bet.
- How often does Germ Goop pay?
- In the base game, 4.7% of spins pay back more than they cost and 70.8% pay nothing. These figures come from the full outcome table, not a simulation.
- Who makes Germ Goop?
- Germ Goop is made by Rat Hole Reels and was released on Oct 22, 2026. It is published on Stake Engine, so its outcome tables are provably fair.
- Where can I play Germ Goop for real money?
- Germ Goop is available for real money at Stake. Use the "Play at" button on this page to open it at the casino you prefer.