We have developed several games to be played against a friend via the Windows Live Messenger chat/messaging client:

Rock Paper Scissors
The game is developed for MSN Norway. It’s also translated and sold to MSN Sweden, MSN Denmark and MSN Netherlands.

Minigolf
We’ve developed two minigolf games for Libris and O’boy.

Straffekonk
Soccer penalty shootout game for Norsk tipping.