Mystery Coin 243 uses a five-by-three fruit grid and a bonus triggered by three or more coin symbols. The bonus begins with five spins. A Mystery Coin on the middle reel can reveal an extra-spin symbol or a doubling symbol applied to the current bonus-spin win. Cash+ and Buy Bonus are paid options, with a cost beyond the ordinary spin. This middle-reel reveal distinguishes the game from a coin slot whose bonus simply locks cash symbols in place.
To compare related slots formats, read the rules of Dolphin's Wealth Fortune and Juicy Splash 10.
The library also explains the difference between lines, ways and clusters to help put these mechanics in context.
Source: published game information.
