The best a slot can ever pay — and how far casinos cut it.

These are the studios' theoretical RTP ceilings: the maximum return each game is capable of. Almost no UK casino deploys the top version — most run it several points lower and don't tell you. This page shows the ceiling and, where we've verified it, the real deployed figure so you can see the gap. Use it to benchmark; use the Platforms page for what you'll actually get.

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Read this first: the RTP figures on this page are theoretical ceilings — the best-case number the studio publishes. They are not what your casino pays. Real casinos typically deploy 2–9 points lower, and the difference is pure extra loss for you. Wherever a "Deployed (worst UK)" figure appears, that's a verified real cut. Everything here still returns under 100% — playing loses money over time.

🏆 Studio ceilings — ranked best-case

Popular UK slots ranked by their theoretical Player-Friendliness (0–100, best-case). The "Deployed (worst UK)" column shows the lowest verified real RTP we've found for that title — the gap is what a casino is quietly taking on top. Click any row to model the ceiling below (and remember: your casino likely pays less).

*Best-case only. Volatility & hit-frequency are modelling estimates; RTP is the studio's published theoretical figure. Your casino's deployed RTP is almost always lower — that's the whole point of the gap column.

🎰 Model a game (at its ceiling)

Pick a studio and game to model its best-case behaviour. This is the friendliest the game will ever be — your real session at a casino running a lower RTP will be worse. Edit the RTP field to your casino's actual figure (from its in-game rules) to model reality.

Game

Session

Jackpot side bet (optional)

Add your own game

Saved on this device.
Your games are stored only in your browser and flagged unverified. They never join the shared leaderboard.
Optimal number of spins
Walk away if UP by
Walk away if DOWN by

Spin counter — step through one session

Balance
£100.00
Spin 0 · Net £0.00 · Staked £0.00
Last spin:
Blue = balance. Gold dashed = walk-up target. Red dashed = stop-loss floor. Grey dashed = starting bankroll. This is the best-case (ceiling) session — reality is worse.

Monte Carlo — many sessions

Total staked
Expected loss
Chance you end UP
Chance you go bust
Adjust inputs and hit Run Monte Carlo.
Distribution of final balances (green = ahead, red = behind) — at the theoretical ceiling.
Chance of being ahead vs spins played — best-case; drops further at your casino's real RTP.