The games here
The Fortune series (Fortune Tiger, Fortune Ox, Fortune Rabbit, Fortune Dragon, Fortune Snake) uses a 3-reel grid and a random feature. Mahjong Ways, Mahjong Ways 2, Treasures of Aztec and Lucky Neko are bigger games built around wilds and growing multipliers.
PG Soft publishes RTP, volatility and maximum win for every game, and those are the figures shown on these pages.