Four Rivers, also known as Shisen-Sho, is a solitaire game played with mahjong tiles. You match tiles similar to other mahjong solitaire games, but in Four Rivers, you connect the edges of two tiles with at most three straight lines. It's a nifty variation on the mahjong game and definitely rewards clever players.

So give Four Rivers a try with this free version for all platforms! You can sample both tile sets and play the Easy level to get a feel for the rules and game play. And if you like what find, you can grab one (or both!) of the full versions for bigger boards and more features.

The Classic game uses traditional characters on the tiles and should have a friendly, familiar feel to anyone who has played mahjong. The Emoji set uses Japanese emoticons on the tiles and has a light, bubbly feel.