What is Gamble Feature?
An optional mini-game offered after a base game win that allows a player to risk their winnings for a chance to double or quadruple them. Typically involves guessing the colour or suit of a playing card. The expected value is neutral (50/50 on colour), but repeated use increases variance significantly.
Related Terms
RTP (Return to Player)
The theoretical percentage of all wagered money a game pays back to players over an infinite number of rounds. A slot with 96% RTP returns £96 for every £100 wagered on average. The inverse of the house edge.
Variance (Volatility)
Describes how a slot distributes its payouts — the balance between win frequency and win size. Low variance means frequent small wins; high variance means rare but potentially large wins. Also called volatility.