Vital Stats: RTP 96.50% | Bonus Buy Cost 100x, 500x | Max Win 100,000x | Review & Demo

The iGaming community went wild when Relax Gaming released its third slot in their Money Train series titled Money Train 3. Players were invited to spin 5 reels across 40 paylines where a maximum jackpot of 100,000x bet could be won.As well as triggering the bonus feature organically, you can buy the bonus round for a 100x bet or go big and guarantee yourself a persistent symbol for the entirety of the feature for a bet of 500x.

Vital Stats: RTP 96.03% | Bonus Buy Cost 100x, 400x, 2000x | Max Win 150,000x | Review & Demo

Continuing with their string of controversial games, provider Nolimit City released the outstanding San Quentin slot featuring a prison theme, 5 reels, 4,096 ways to win and their now iconic xWays mechanic. However, the biggest draw to this highly volatile game is its jaw-dropping maximum win of 150,000x the bet.Utilising the feature buy menu in this slot offers you three free spins rounds to choose from, with additional positions unlocked in the bonus round the higher up you decide to bet.

Vital Stats: RTP 96.50% | Bonus Buy Cost 100x | Max Win 50,000x | Review & Demo

One of the earliest online slots to include a feature buy and, at the time, one of the most popular games online was Blueprint's 6-reel Megaways slot, Vikings Unleashed. Played with up to 117,649 paylines on every spin, the slot included mystery symbols, a jackpot of 50,000x bet and a free spins bonus featuring an unlimited win multiplier.

Four scatters are needed to trigger the free spin round organically, or you can buy the bonus for 100x the current bet. The big twist to this bonus was you could gamble your starting spins and win multiplier. Push it too far though, and you could end up with nothing.

Vital Stats: RTP 96.15% | Bonus Buy Cost 50x | Max Win 20,000x | Review & Demo

Extra Chilli Megaways may not have been Big Time Gaming's first slot to include a bonus buy option, but this 6 reel 117,649 payline game was one of the most played online slots in the early days of the feature buy when only a few games included the option. Along with stacked symbols and an unlimited win multiplier in the free spins round, Extra Chilli came with an RTP of 96.15% and a max win of 20,000x bet.Spelling out the word HOT will trigger the free spins bonus feature, or this can be initiated instantly for 50x bet. Once activated, you'll find yourself at the gamble wheel, where if you've got the kahunas, you'll reach the max spin total of 24.

Vital Stats: RTP 96.51% | Bonus Buy Cost 100x | Max Win 21,100x | Review & Demo

Pragmatic Play's Sweet Bonanza remains hugely popular around the globe, so much so that it has spawned several clones that now reach over 20 in total. Played over a 6x5 reel matrix, this is a scatter pays slot that awards a cash prize when 8 or more matching symbols appear anywhere in view. Along with its healthy RTP of 96.51%, the game boasts stacked symbols, a top win of 21,100x the stake and huge multiplier symbols that can be applied to your wins during the free spins round.

Playing the game normally to trigger the bonus game will require at least 4 lollipop scatter symbols to land in view, but if you want to take a shortcut and get straight into the thick of the action, you can pay a very reasonable 50x bet, and you'll instantly be welcomed into candy heaven.

Vital Stats: RTP 96.50% | Bonus Buy Cost 100x | Max Win 5,000x | Review & Demo

They must really like the sweet stuff over at Pragmatic Play headquarters, as their cluster pays slot, Sugar Rush, has also proved to be a hugely successful release. The game is set across a 7x7 reel format, and a winning combination is formed when 5 or more matching symbols land adjacent to each other. With a max win of 5,000x bet and an RTP of 96.50%, Sugar Rush also has a highly entertaining in-game mechanic where overlay multipliers can reach up to a staggering 128x and then be applied to your winning combination.You'll need at least 3 scatter symbols to hit for the bonus round to be triggered. However, if you don't want to wait around for that to happen, you can gain instant gratification by parting with 100x the bet to buy the buy and watch the scatters roll in on the very next spin.

Vital Stats: RTP 96.55% | Bonus Buy Cost 106x, 186x, 500x, 550x | Max Win 100,000x | Review & Demo

The highly anticipated release of Push Gaming's Razor Returns brought with it 40 fixed paylines, a high RTP of 96.55%, and a monster jaws-like jackpot of 100,000x bet. The classic free spins feature remains but with a slight twist where big multipliers can now be active from the start, and the addition of the Razor Reveal feature, where the screen is filled with coins for potential wins, multipliers and modifiers to land and come into play.Both of the bonus features can be triggered with a click of a button, with the free spins being offered in three tiers with no starting multiplier (106x), one of 5x (186x) or one of 25x (550x),  although these can be gambled up to a max of 100x. Those who want to play the Razor Reveal feature instantly can part with 500x the bet for as green full of coins to roll in on the very next press.

Vital Stats: RTP 96.80% | Bonus Buy Cost 60x | Max Win 111,111x | Review & Demo

NetEnt's original Dead or Alive slot produced some of the biggest hits ever seen online on the earlier days of online slots, so the release of their title Dead or Alive 2 and its big win jackpot of 111,111x bet produced mass hysteria amongst online players. The slot features its trademark 9 paylines, just like the original, along with some well know pay symbols and famous outlaws in the bonus rounds. Speaking of which, unlike its predecessor, which had just one free spins feature, its sequel boasts three bonus features, with players having the option to choose from low, medium and high volatility. Playing those bonus games will require a minimum of 3 scatter symbols to land in view. If you've got a thirst on though, and want to get straight into the saloon in search of a famous wild symbol line, you can trigger them instantly with the feature buy option at the cost of 60x bet.

Vital Stats: RTP 96.27% | Bonus Buy Cost 80x, 200x, 400x | Max Win 12,500x | Review & Demo

As you may have guessed, Hacksaw Gaming's Wanted Dead or a Wild is a Western-themed slot. It is set over a reel formation of 5x5 with a total of 15 fixed paylines, an RTP of 96.27% and a maximum prize of 12,500x the bet. You've got three bonus rounds that can be triggered during normal gameplay, all of which are highly volatile but have massive potential of paying you a healthy return.Through Hacksaw's bonus buy feature option, you can play the Great Train Robber feature for 80x the bet, the Duel at Dawn feature for 200x bet, and last but not least, the Dead Man's Hand feature at 400x the bet, all of which are extremely exciting bonus games.

Vital Stats: RTP 96.70% | Bonus Buy Cost 80x, 200x, 400x | Max Win 20,000x | Review & Demo

Pragmatic Play's fishing-themed Big Bass Bonanza Hold & Spinner Megaways comes with some pretty impressive-looking statistics. For a start, we have up to 147,456 paylines that can be active, a super generous RTP of 96.70%, a humongous max bet of €250, and a maximum prize that tops out at 20,000x bet. There's more to come though, in the form of the game's two bonus rounds, the standard free spins feature and the Hold & Spinner bonus round, where a special set of reels come into play.Land at least three scatters in view to trigger free spins, whilst the Hold & Spinner feature is activated when three or more coin symbols are visible on the reels. Alternatively, you can trigger both bonuses instantly via the feature buy at the cost of 100x and 120x, respectively.