SIMPLE Series G4U Vol.1: The Mahjong is a digital mahjong title developed by Yuki Enterprise and published by D3 Publisher in 2014. The game features multiple modes including Free Match with customizable rules, Challenge mode with objective-based progression, and M1 League where players compete to reach the top ranking. Online multiplayer supports up to four players. The game includes rule explanations, a glossary, and a “Support Play” system that assists beginners by suggesting tile discards. Additional features include match record saving and unlockable cosmetic tile and board variations.