Bonus buy slots — also known as feature buy, bonus purchase, or ante bet slots — are games that include a mechanism allowing players to pay a premium to enter the free-spins or bonus feature directly, bypassing the base game entirely. The mechanic became widespread between 2018 and 2022, appearing on titles from nearly every major provider. However, for UK players, bonus buys have been prohibited since October 2021 under UKGC regulations. Understanding what they are, how they work mathematically, and what alternatives exist for UK-based players is useful background for anyone navigating the current slot market.
What Bonus Buy Actually Does
In its standard implementation, the bonus buy mechanic lets a player pay a fixed multiple of their current stake to immediately trigger the slot's free-spins or bonus feature. Common pricing:
- 50x the base stake: the most frequent price point. On a £1 per spin base stake, this costs £50 to buy directly into the bonus.
- 75x: used by providers like Relax Gaming on some titles.
- 100x: used on several Nolimit City titles.
- 200x–300x: the highest-priced implementations, typically on high-volatility games where the bonus is the primary source of value.
The free-spins feature bought via the bonus purchase is mathematically identical to the free-spins feature triggered organically in the base game. You receive the same average number of spins, the same multiplier mechanics, and the same distribution of outcomes. The only difference is that you have paid the premium to access it immediately rather than waiting for scatter symbols to land in the base game.
The Mathematics of Bonus Buying
The bonus buy price reflects the expected value of the free-spins feature in isolation. If the bonus feature of a 96.5% RTP slot contributes 60% of the total RTP — which is common in high-volatility games where the feature provides most of the value — then the feature's expected return is approximately 57.9% of every pound wagered in total.
The buy-in price of 50x the stake is calibrated so that the expected value of the feature you enter equals roughly the 50x you paid — with a small house edge built in. The slot provider calculates the average feature payout across millions of simulated bonus rounds and prices the buy accordingly.
In practice, this means:
- Paying 50x stake to enter a feature that has an average payout of 47x stake: you are paying a slight premium for the convenience and certainty of immediate feature entry.
- The variance of the feature is identical whether you bought in or triggered organically.
- You are not getting better odds than a player who triggered the feature naturally; you are simply skipping the waiting period.
Ante Bet as a Softer Alternative
Some providers, particularly NetEnt on older titles, offered an "Ante Bet" function that increased the base stake by 25% in exchange for a higher scatter symbol frequency. This is mechanically different from a direct bonus buy — you are still playing the base game, but with enhanced scatter probability. The effective cost of reaching the feature is lower, and the experience remains base-game play. UK players could access ante bet functions since they did not constitute a direct feature purchase; however, many providers removed these functions anyway during the 2021 regulatory updates.
The UK Ban: What the UKGC Said
The Gambling Commission's October 2021 Social Responsibility Code provisions included an explicit prohibition on slot features that "allow the player to pay to enter the bonus feature." The rationale was consumer protection: bonus buys allow players to expose significantly more than their base stake in a single transaction (£50 or £100 at one click versus £1 per spin), and the Commission determined this was inconsistent with the product safety requirements applying to UK operators.
This ban applies to all operators holding a UKGC licence. Any casino allowing UK players to use bonus buy functions is in violation of licence conditions. Regulatory action has followed where this has been identified.
The ban does not apply to:
- The underlying slots themselves. Gates of Olympus and other bonus-buy-capable games are fully available in the UK; only the bonus buy button is removed.
- Jackpot buy-in mechanics. Some providers' jackpot products allow players to increase their jackpot contribution rate, which is treated differently.
- Free-spin awards from casino promotions. A casino awarding free spins on a particular game as a bonus is not the same as a player purchasing direct feature access.
Which Providers Were Most Associated With Bonus Buys
Before the UK ban, several providers built bonus buy as a central commercial feature:
- Pragmatic Play: most of their high-profile titles (Gates of Olympus, Sweet Bonanza, The Dog House) included bonus buy at 50x–100x the stake. UK versions have the feature removed.
- Nolimit City: titles like San Quentin xWays and Mental offered bonus buys at 60x–300x the stake. Very high-volatility implementations where the premium reflected the extreme feature variance.
- Hacksaw Gaming: developed a reputation for high-stakes bonus buy implementations on their original titles.
- Push Gaming: Jammin Jars 2 and similar titles included bonus buys at prices reflecting their high feature-contribution RTP.
- Relax Gaming: offered "Bonus Bet" mechanics that increased scatter frequency rather than a direct buy, occupying a middle ground.
All these titles are available in the UK with the bonus buy functionality disabled.
What UK Players Have Instead
The absence of bonus buy features does not mean UK players have worse access to the underlying games. The same titles, the same base-game mechanics, and the same free-spins features are fully accessible — they simply require triggering through normal base-game play.
Alternatives that serve a similar function for players who want rapid feature entry:
High-Frequency Scatter Games
Some slots are engineered with more frequent scatter symbol appearances, reducing the average time and cost to reach the bonus organically. Book-style slots with three-reel scatter triggers tend to reach their feature every 100–150 base-game spins rather than the 250+ spins typical of some five-scatter games.
Stake Adjustment
The logic behind bonus buys was partly about shortening the expected time to feature entry. Increasing your base stake has a similar effect: doubling your stake roughly halves the number of spins you play per feature trigger (the feature trigger probability is the same per spin, but each spin costs more, so you spend the same expected total on reaching the bonus). UK players who want fewer, higher-stake spins between features effectively replicate some of the bonus buy experience through stake selection.
Games With Built-in Feature Re-Triggers
Book-style games and many high-volatility slots allow the free-spins feature to retrigger if scatter symbols land during the feature. Games with high retrigger rates provide extended bonus experiences without requiring separate purchases.
What Has Not Changed Since the Ban
Several misunderstandings persist about the UK bonus buy ban. To clarify:
- Free spin promotions remain fully legal. Casinos can still award players free spins on specific games as promotional tools.
- Casino bonus matches remain legal. The ban targets the in-game purchase mechanic, not promotional structures.
- RTP is not affected by the absence of bonus buy. A game's certified RTP does not change when the bonus buy button is removed for UK players.
- The feature itself is not different. When UK players do trigger the bonus organically, the feature mathematics are identical to what a bonus buyer would experience in other markets.
Conclusion
Bonus buy slots represent a straightforward acceleration mechanic: pay a multiple of your stake to skip the base game and enter the free-spins feature. The mathematics are fair — the price reflects expected feature value with a built-in house edge — but the UKGC determined that the mechanism facilitated spending levels inconsistent with consumer protection principles. UK players in 2026 access the same games without the feature. The base-game experience, the triggered bonus, and the RTP are unaffected. For players who want to reach bonuses faster, choosing games with frequent scatter appearances, adjusting stake size, or selecting titles with retrigger mechanics are the practical alternatives available within UK regulation.