Slot Bonus Rounds — Complete UK Guide

The bonus round is where modern slots produce their biggest wins. Understanding the main types helps you choose games that suit how you like to play.

Free spins rounds

The most common bonus, triggered by landing scatter symbols (usually three or more). Free spins often add features not present in the base game — expanding wilds, increasing multipliers, or extra reels. In many high-volatility slots, almost all of the long-run return is concentrated in this feature, which is why base-game play can feel dry.

Hold and respin / lock features

Symbols lock in place while the rest of the reels respin, often seen in cash-collect slots like the Big Bass series. Each new matching symbol resets the respins, building towards a fuller grid and bigger collection of cash values.

Pick-and-click bonuses

You choose from hidden objects to reveal cash prizes, multipliers, or extra picks. These reward rounds are usually lower variance than free spins — smaller but more reliable payouts.

Buy bonus features

Many modern slots let you pay a multiple of your stake (often 80x–100x) to trigger the bonus instantly. It does not improve your odds — the RTP is similar or marginally different — but it removes the wait. See our buy bonus guide and our buy bonus slots list.