Free spins and bonus buys: what the button actually changes

2026-08-14 · Camille Roussel

How the free round is triggered

The classic trigger runs on scatter symbols: three or more anywhere on the grid open a run of free spins. Almost the whole catalogue works this way, from Pragmatic Play's Blade & Fangs (96.05%) to Platipus' Guises of Dracula (95.09%).

Part of a game's theoretical return lives inside that phase. On high-volatility titles it holds most of it, which is exactly why base play runs dry for so long.

Trigger frequency is almost never published by studios. It is inferred from the stated volatility, not from an official figure.

Choosing your free-spins mode

7rings Gaming's Blood Hoppers and Pragmatic Play's Vampires vs Wolves offer several formulas at the moment of the trigger: fewer spins with a high multiplier, or more spins at a lower one.

The options are calibrated to return roughly the same on average. What they change is the spread: the short, high-multiplier formula produces more extreme results in both directions.

There is no correct pick in that menu. There is a pick consistent with the session length you set for yourself.

The bonus buy and its real cost

The Buy Feature tag appears across a large share of this catalogue: Bloody Dawn, Bloody Waltz, Blood Diamond, Fang City, Book of Vampires, Blood Moon Riches, Bloody Murder and others. The button purchases direct entry to the free-spins phase for a multiple of the stake.

The price is set so the theoretical return stays close to that of normal play, sometimes slightly different depending on the studio. The buy therefore creates no mathematical edge.

What it creates is a tempo: you jump from a unit stake to an amount twenty to a hundred times larger, several times over. At a fixed budget the number of chances to play collapses. That is the real cost, and it is behavioural.

Multipliers inside the phase

Gamebeat's Bloody Waltz, Pragmatic Play's Bloody Dawn and Blood Hoppers all stack a multiplier that climbs during free spins. Kalamba Games' Blood Moon Express (97.48%) prefers sticky wilds, which hold their place for the whole run.

The two approaches produce different curves. A climbing multiplier rewards long cascade chains; sticky wilds steady the yield of every individual spin.

Nolimit City's Blood & Shadow 2 combines both with a tier system that upgrades the grid as the phase progresses, which is how it reaches a 16,161x ceiling.

The games without free spins

Jelly's Nosferatu Bite Night (94.04%) has no free-spins run at all: it works through respins with sticky symbols and random multipliers. Onlyplay's Hit the Vampire rests entirely on a hold and win with fixed jackpots.

The absence of free spins is not a gap. It means the variance was placed in a different phase, and often a shorter, more readable one.

On those machines a bonus buy, where it exists, purchases entry to the respin rather than to a run of free spins. The cost arithmetic is unchanged.

One rule before pressing

Before any buy, it is worth converting the displayed price into ordinary spins. A hundred times the stake is a hundred base-game spins; the question becomes concrete.

On a high-volatility game a single buy stands a good chance of returning nothing, exactly like a bonus round triggered naturally. The difference is that it was paid for in one go.

Demo mode lets you run that arithmetic without committing anything, and that is by far the most useful thing to do with it.