Mahjong is an informational website that helps readers find and compare online mahjong games, with a focus on free ways to play. Its guides cover options ranging from registration-free browser games and CPU practice apps to competitive online platforms for playing against other people. The site organizes recommendations by purpose and platform, and provides comparisons of game formats, payment methods, and features.

Its coverage includes well-known services such as Tenhou, SEGA NET Mahjong MJ, Mahjong Soul, and Maru-Jan, alongside free practice options such as Mahjong Tensei and Janten. Articles also discuss platforms with paid play or real-money features, including their game modes and payment methods, so readers can understand how offerings differ. The site introduces basic mahjong rules and terminology, explains how to get started with online play, and offers guidance for beginners as well as experienced players seeking practice or competition. By bringing recommendations, feature summaries, and practical explanations together, Mahjong serves as a resource for choosing a game that suits a reader’s interests and preferred way to play.