hello, Mind Games is free until May 7 2014:
Mind Games | Windows Phone Apps+Games Store (United States)
mind games it's:
2 games in 1, a minesweeper game and a Mental arithmetic game, both online.
-the games are online, sessions keep coming, at the end of each session, the ranking of players connected to the session is displayed.
-11 success to unlock
have fun!
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