Super Street Fighter IV

Create lobby with a friend and beat them 3 straight in that lobby. If you leave the lobby your counter will start over at 0.

Many people use Endless Matches as a way to practise using new characters. Use this to your advantage when hosting by using your best character. Change the Round limit to 1 if you find you perform better that way. This is also very easily boostable if you're not too good at the game by hosting a Endless Battle and having private slots for friends to join. Have them let you win 3 times in a row and voila. Also works for Endless Ten!