15 Coins Grand Diamond Edition is Wazdan's coin-collection slot with a Hold the Jackpot feature. Five bonus symbols across the middle row open the bonus, while filling the board is the condition for its Grand Jackpot. When the bonus counter reaches zero, the edition's Cash Out modifier applies a randomly selected percentage to the collected bonus-symbol total. Read that percentage as a settlement modifier, not a guaranteed increase. This condition differs from ordinary payline matching and should not be replaced with another Coins edition's entry rules.
To compare related slots formats, read the rules of 9 Coins™ and Mystery Coin 243.
The library also explains the difference between lines, ways and clusters to help put these mechanics in context.
Source: published game information.
