Illegal Mahjong

If you're a fan of Mahjong this game is quite fun because... well you like Mahjong lol. It does that well and also provides a nice side of lewd outfits / scenes on loss. If you're not familiar I probably wouldn't bother but if the concept interests you definitely give it a download. Also scene unlock is clearly available in the options menu which is very much appreciated if you don't want to lose to unlock scenes.

This is Riichi Mahjong, which is more or less like Chinese Mahjong with a different ruleset on top of it in regards to which hands are valid for winning (see link below or google yourself). It is a relatively short game. As a mahjong game, it's not bad, matches goes by pretty quick and there are some visual aids to help you play. After the first set of matches you gain access to cheats which more or less makes it impossible for you to lose if you have even a slight idea of how to play mahjong. Though you're expected to win without cheats in the final match for a "true ending". For the H portion, it's about par for the course. You gain access to scenes by losing matches. The scenes themselves are probably about the same as a visual novel, nothing special. Also probably more 3.5 than 4, the H scenes really are nothing special. Quick Riichi guide https://mahjong.guide/a-beginners-guide-to-riichi-mahjong/