For players seeking high RTP (Return to Player) slots outside of GamStop restrictions, 2025 brings a variety of exciting options. These slots not only offer thrilling gameplay but also provide some of the highest payout percentages available. Below, we break down the top five non-GamStop slots with the highest RTP, ensuring that players have a solid chance of maximizing their winnings.
1. Book of 99 (RTP: 99%)
Provider: Relax Gaming
Features: Free Spins, Expanding Symbols
Book of 99 is a standout slot due to its exceptionally high RTP of 99%, which is much higher than the industry standard. Inspired by ancient Greek mythology, the game follows an explorer uncovering hidden knowledge from mystical books.
Why It Stands Out:
- Exceptional RTP: One of the highest RTP slots available.
- Expanding Symbols Feature: Enhances winning potential.
- Free Spins Bonus: Activated by collecting special book symbols.
This slot is perfect for players looking for a high-paying game with frequent rewards. The variance is relatively high, meaning big wins are possible but may require patience.
2. Ugga Bugga (RTP: 99.07%)
Provider: Playtech
Features: Reel Hold Feature
Ugga Bugga is a classic non-GamStop slot with a unique layout and a staggering RTP of 99.07%. This tribal-themed slot features 10 sets of reels and allows players to hold symbols to increase winning chances.
Why It Stands Out:
- Extremely High RTP: Above 99%, making it one of the most profitable slots.
- Reel Hold Mechanic: A rare feature that lets you lock reels for better wins.
- Low Volatility: Frequent but smaller wins, ideal for long gaming sessions.
Despite its retro graphics, Ugga Bugga remains one of the best options for those who prioritize high returns over flashy visuals.
3. Mega Joker (RTP: 99%)
Provider: NetEnt
Features: Progressive Jackpot, Supermeter Mode
Mega Joker is a classic fruit machine-style slot that offers one of the best RTPs in the industry at 99%. The game has two modes: Basic Mode and Supermeter Mode, casinos not on GamStop where players can win even bigger payouts.
Why It Stands Out:
- 99% RTP: Offers one of the best payout percentages in the market.
- Progressive Jackpot: Gives players a chance to hit massive prizes.
- Supermeter Mode: An advanced feature that lets players gamble their winnings for higher rewards.
Since it has high volatility, it may not be ideal for beginners, but seasoned players love it for its potential big wins.
4. Goblin’s Cave (RTP: 99.32%)
Provider: Playtech
Features: Hold Feature, Bonus Rounds
Goblin’s Cave is another extremely high RTP slot at 99.32%, making it one of the best-paying games outside GamStop. The game follows a mischievous goblin guarding treasure, and players can use the Hold Feature to lock in valuable symbols.
Why It Stands Out:
- One of the highest RTP slots at 99.32%.
- Hold Feature: Gives players control over reel outcomes.
- Low Volatility: Ensures frequent wins.
This slot is ideal for players who enjoy strategic gameplay and consistent payouts rather than relying on pure luck.
5. 1429 Uncharted Seas (RTP: 98.6%)
Provider: Thunderkick
Features: Expanding Wilds, Free Spins
1429 Uncharted Seas is a visually stunning slot with a 98.6% RTP and a nautical adventure theme. The game includes Expanding Wilds and a Free Spins feature, making it both lucrative and entertaining.
Why It Stands Out:
- High RTP at 98.6%.
- Unique Hand-Drawn Art Style: Creates a visually immersive experience.
- Low to Medium Volatility: Ensures frequent and decent-sized wins.
If you enjoy a balance of frequent payouts and fun gameplay, this is one of the best non-GamStop slots available in 2025.
Conclusion: Which High RTP Slot Should You Play?
If you’re looking for the absolute highest RTP, Goblin’s Cave (99.32%) and Ugga Bugga (99.07%) are top choices. However, if you prefer classic-style gameplay, Mega Joker (99%) and Book of 99 (99%) offer exciting options. For players who value aesthetics and adventure, 1429 Uncharted Seas (98.6%) is a fantastic choice.
