Another of the Microsoft card games, and the first one with multiplayer support. Still, it didn't quite gain the popularity of its sister games.
Debug Mode#
This game has a debug mode, but it's a bit harder to enable here because it requires editing the Windows registry.
Open a registry editor and go to key HKCU\Software\Microsoft\Windows\CurrentVersion\Applets\Hearts (create any sub-keys that don't exist). Add a REG_SZ named ZB and set its value to 42.
After having done this, start the game and you'll be able to use the keyboard combination Ctrl + Shift + Alt + F12 to see the cards of your competitors. This was probably used to test the game engine and possibly also the AI.