Top-paying slots with bonus buy

1. Dead or Alive 2 Feature Buy from NetEnt

Cost of bonus game: x66 per bet
Maximum possible payout: x111111

The first version with a bonus buy was released on April 23, but was soon withdrawn.
Maybe it was a test version.

On October 20 NetEnt officially introduced a standalone slot with a bonus buy called Dead or Alive 2 Feature Buy, with slightly increased bets (compared to Dead or Alive 2)

2. CherryPop from Yggdrasil Gaming

Cost of bonus game: x75 per bet
Maximum possible payout: x56386

This slot is a continuation of the “Pop” slots from Yggdrasil Gaming.
A distinctive feature of all these slots is a high maximum payout per spin.

CherryPop is the first slot in this line that has a bonus buy

3. Hellcatraz from Relax Gaming

Cost of bonus game: x200 per bet
Maximum possible payout: x51840

A Relax Gaming slot with a high maximum payout and several bonus buy options

4. Money Train 2 from Relax Gaming

Cost of bonus game: x100 per bet
Maximum possible payout: x50000

The sequel to the well-known Money Train slot with a high maximum payout per spin

5. Legacy of Ra Megaways from Blueprint Gaming

Cost of bonus game: x100 per bet
Maximum possible payout: x50000

A Book-style slot with Megaways mechanics and a high maximum payout per spin

6. Wolf Legend Megaways from Blueprint Gaming

Cost of bonus game: x75 per bet
Maximum possible payout: x50000

A slot with Megaways mechanics and a high maximum payout per spin

7. Ramses Revenge from Relax Gaming

Cost of bonus game: x80 per bet
Maximum possible payout: x49996

A new release from Relax Gaming, somewhat reminiscent of “Bonanza”, but with its own mechanics

8. Drago Jewels of Fortune from Pragmatic Play

Cost of bonus game: x100 per bet
Maximum possible payout: x48000

A slot with a claimed high maximum payout per spin, but how realistic is it?

9. Book of Shadows from Nolimit City

Cost of bonus game: x60, x120, x90 per bet
Maximum possible payout: x30338

A modified Book game with different bonus buy options

10. Machina Megaways from Kalamba Games

Cost of bonus game: x52.08, x89.58, x185, x337.08 per bet
Maximum possible payout: x26000

A slot with Megaways mechanics and four bonus buy options

11. Star Bounty from Pragmatic Play

Cost of bonus game: x75 per bet
Maximum possible payout: x25920

A rather interesting new release from Pragmatic Play

12. Dragon Fall from Blueprint Gaming

Cost of bonus game: x100 per bet
Maximum possible payout: x25000

“Bonanza”-style game by Blueprint Gaming with a bonus buy

13. Hypernova Radial Reels from ReelPlay

Cost of bonus game: x66 per bet
Maximum possible payout: x25000

“300 shields” in a spherical version with the maximum payout per spin doubled (compared to the original from NYX)

14. Extra Chilli from Big Time Gaming

Cost of bonus game: x50 per bet
Maximum possible payout: x20000

A light version of the “Bonanza” slot with a bonus buy mode

15. Punk Rocker from Nolimit City

Cost of bonus game: x80 or x238 per bet
Maximum possible payout: x15000

The slot that made many people aware of the Nolimit City developer

16. Deadwood from Nolimit City

Cost of bonus game: x71 or x750 per bet
Maximum possible payout: x13950

A slot with different bonus buy options, the highest of which costs x750 per bet

17. White Rabbit from Big Time Gaming

Cost of bonus game: x100 per bet
Maximum possible payout: x13000

A widely known slot themed around Lewis Carroll’s Alice in Wonderland

18. The Dog House Megaways from Pragmatic Play

Cost of bonus game: x100 per bet
Maximum possible payout: x12305

A sequel to The Dog House with Megaways mechanics and a bonus buy

19. Gems Bonanza from Pragmatic Play

Cost of bonus game: x100 per bet
Maximum possible payout: x10000

A cluster-style new release from Pragmatic Play with a mode to buy extra rounds

20. Chaos Crew from Relax Gaming

Cost of bonus game: x129 per bet
Maximum possible payout: x10000

A slot that can unofficially be called a light version of Money Train

Source: TTR BLOG

Thanks for the roundup, I marked a few slots for myself. I had some nice hits on a few. Krolik and DoA paid out the most.