This is "shanghai". Or "dragon".
Normally these games use the Mahjong "tiles", but it's not the actual game.
This game doesn't even use those tiles, so the name is thoroughly misleading.
FYI, THIS is mahjong: http://www.gamedesign.jp/flash/mahjon g/mahjong_e.html
I'd recommend calling the game "sexy tile matchup" or something...
At any rate, the game is simple enough, nothing too original.
The graphics are a bit small and sometimes hard to distinguish since you're not using numerals as is common.
The music, I turned off pretty quickly.
I was expecting more from the shop, but even in it's current form, it makes an already easy game even easier.
Perhaps some avatar, to buy items for might make for a short diversion.
Achievements, or NewGrounds medals are always a welcome addition as well.. This game has neither of those.