Just Slots launches first dedicated exclusive with 500 Casino: Book of Maniac 500

High-volatility ‘Book of’ title introduces gamble wheels, bonus buys and a 500,000x max win as an operator-exclusive release.

Just Slots has launched Book of Maniac 500 as its first dedicated exclusive, releasing the new slot in partnership with 500 Casino.

The five-reel, 10-payline title follows the ‘Book of’ format with expanding symbols and a Free Spins feature, while adding multipliers that increase with each bonus retrigger. Just Slots says the game has high volatility and a maximum win potential of 500,000x.

In the base game, any spin can trigger a Special Expanding Symbol. A symbol may be randomly selected before the reels stop and assigned a multiplier of up to 100x. If it forms a winning combination, it expands to pay across all 10 paylines “without needing to land on adjacent reels,” with the multiplier applied. Three, four or five wild symbols trigger 10 Free Spins, with four wilds guaranteeing at least a 2x starting multiplier and five wilds raising that minimum to 10x.

Ahead of the Free Spins feature, players can either accept the awarded spins or use up to three Gamble Wheels to attempt to upgrade the expanding symbol, the starting multiplier, or both. If the gamble is unsuccessful, the feature is forfeited and play returns to the base game. During Free Spins, landing two or more Wilds awards additional spins and adds a new multiplier of up to 100x to the existing value.

The release also includes three Bonus Buy options—Stalker, Slasher and Maniac—priced at 150x, 500x and 2,000x the base bet respectively, plus a HotSpin Ember option that increases feature trigger chance for a total stake of 3x the base bet.

Nick Formosa, Head of Client Strategy at Just Slots, said: “Book of Maniac 500 takes the classic ‘Book of’ formula somewhere far darker, with a creepy deserted campsite setting and impressive multipliers that build every time Free Spins retrigger there really is a lot to love about this release.

“We are thrilled to be launching this game exclusively with 500 Casino, it gives players a distinctive addition to their lobby and demonstrates how Just Slots can bring our own creative approach to exclusive content. We’re looking forward to seeing their response when the book opens.”

Henrik Bergström, Head of Casino at 500 Casino, said: “We are extremely excited to have been chosen as the home of Just Slots’ first-ever dedicated exclusive. Not only have we got a fantastic new slot in Book of Maniac 500, but we’ve also established a fantastic partnership with a fast-growing studio who will go on to produce even more great games for our players to enjoy.”