Bonus buy mechanics in online casino slot games

The 'bonus buy' mechanic in online slot games allows players to pay a multiple of their stake to bypass base gameplay and enter a game’s feature or bonus round directly. Costs for these features typically range from 50 to 500 times the original stake, depending on the specific game and configuration.

Mathematical returns for bonus buys are certified separately from the base game. While some players assume these buys offer better odds by skipping base-game variance, the actual Return to Player (RTP) can vary; in some titles, the bonus buy return is slightly higher than the base game, while in others, it is lower.

Because the cost of a bonus buy scales with the player's stake, a single click can represent a substantial standalone wager. For example, a 100x buy on a £5 spin results in a £500 wager. Players are advised to check the specific information panel for the exact return rates of different tiers within a game, as different tiers of the same bonus may have different mathematical properties.