World Jan is a tile game you play one on one against the computer, in your browser, with nothing to install and no account. The tiles show the landmarks of 18 countries, Mount Fuji, the Pyramids, the Statue of Liberty and fifteen more, each numbered 1 to 3. You win a hand by making three sets from your 9 tiles before the CPU does.
The rules are a simplified, family version of mahjong: there are Pon, Chi, Ron and riichi, but only three sets to make, no scoring tables to memorise, and riichi declares itself. Where mahjong has suits, World Jan has regions, and where it has yaku, World Jan has geography: a hand of Pacific countries, of the New Seven Wonders, of the southern hemisphere. Every win plays a short cut-in for its yaku, read aloud in English.
Draw a tile, discard a tile. A set is three of the same tile (a Triplet) or one country's 1, 2 and 3 (a Route); a Globe stands in for any tile. When the CPU discards something you want, call Pon or Chi, or Ron to win with it. A match is 4 hands and the higher score wins. The CPU comes in three levels; Hard calls fast and plays around your riichi.
Every landmark on the tiles is an original drawing for this game, and every country belongs to some of the 21 yaku: Japan to Pacific Rim, Natural Wonders and the Island Hopper yakuman, Peru to four groups at once. The landmarks page tells you where each one stands and what it is; the yaku page shows every yaku with an example hand; the tips page explains how to beat the CPU, with the numbers from thousands of matches it played against itself.