The Yahoo! Games plug-in shows a collection of free Java and Flash based games. These are multi player games and can be played with anyone using Windows Messenger 6.0 or above.

Here's how to play a game:

1. Make sure you have installed the "Games Challenge" plug-in.
2. Click Play Multi-Player Games. The "Play a Game" dialog box opens. In it, you will see the list of your contacts.
3. Double-click a contact name. This opens an expanded IM window with a list of games on the right side.
4. Click Invite Friend next to the game you want to play and an invitation will be sent. The contact must click Accept to prompt the game to load.