Thinking about giving Crazy Lab a spin? We tested it thoroughly so you know what to expect. Built by Caleta Gaming, it lands as a slot game with high variance and a return-to-player rate of 95.47%. Originally released in 2017, it has aged well. Visually it's built around a horror theme, with the action running on 15 paylines across 5 reels. Top wins are capped at 100,000x your stake, a genuinely massive ceiling for the patient. The full verdict is below.
Written by Sophie Williams · Last updated: February 2026
Crazy Lab is a slot game from Caleta Gaming, built around a horror theme and powered by 15 paylines across 5 reels. The result is a high-variance maths model paired with a return-to-player rate of 95.47%.
Dig into the bonuses and Crazy Lab starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. With high variance, this one is aimed at players who can ride out the swings for the top wins. On balance, Crazy Lab is a dependable option worth a few spins in the demo first.
At 95.47%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
High volatility means longer gaps between wins, but when wins do land, they can be significantly larger. A bigger bankroll and patience are recommended for this type of slot.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Crazy Lab features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
3.0 / 5 — Good
Crazy Lab by Caleta Gaming is a solid offering that delivers good entertainment value. The 95.47% RTP combined with high volatility creates a well-balanced gaming experience.