Two Numbers That Define a Game's Behaviour
When analysing how a digital game is designed, two concepts stand above all others: RTP (Return to Player) and volatility. Many people focus only on RTP, but volatility — sometimes called variance — is equally important for understanding how a game actually plays out in practice.
These two figures are related but distinct. Understanding both gives you a much clearer picture of a game's true character.
Quick Definitions
- RTP: The theoretical percentage of wagered money returned to players over a very large number of rounds. It describes the long-run expected return.
- Volatility: A measure of how frequently and how dramatically a game's outcomes deviate from its average payout. It describes the risk and reward profile of the game.
How Volatility Works in Practice
Two games can share an identical RTP of, say, 96% — yet feel completely different to play. Here's why:
Low Volatility Games
A low-volatility game is designed to pay out frequently, but typically in smaller amounts. Players experience a relatively steady stream of wins, and their bankroll tends to fluctuate less dramatically. The game "feels" more consistent.
High Volatility Games
A high-volatility game may go long stretches without significant wins, but when it does pay out, the amounts can be much larger. The bankroll of a player can swing dramatically — both upward and downward — in short periods.
Medium Volatility Games
These attempt a balance between the two extremes, offering moderate win frequency with moderately sized payouts. They are often described as the most widely appealing design choice.
Why the Same RTP Can Feel Very Different
Consider this simplified comparison:
| Feature | Game A (Low Vol) | Game B (High Vol) |
|---|---|---|
| RTP | 96% | 96% |
| Hit Frequency | ~40% of rounds | ~15% of rounds |
| Typical Win Size | Small (0.5x–2x stake) | Large (10x–500x+ stake) |
| Bankroll Swings | Gradual | Dramatic |
| Long-Run Return | Identical | Identical |
Mathematically, both games are equivalent in the long run. The experience, however, is radically different.
Hit Frequency: The Third Piece
Closely related to volatility is hit frequency — the percentage of rounds that produce any return (even a small one). A game with a 35% hit frequency produces a win or partial return roughly 35 out of every 100 rounds, regardless of size. Hit frequency and volatility together help explain the texture of gameplay far better than RTP alone.
How Developers Design for Volatility
Game designers control volatility through several levers:
- Paytable structure: Top prizes vs. small prize distribution
- Bonus trigger frequency: How often special features activate
- Bonus payout potential: Maximum multipliers within bonus rounds
- Symbol distribution on reels: Frequency of high-value vs. low-value symbols
Key Takeaways
- RTP and volatility are both necessary to understand a game's design.
- Two games with the same RTP can have dramatically different playing experiences.
- Low volatility = frequent small wins; high volatility = rare but larger wins.
- Neither design is inherently "better" — they suit different preferences and play styles.