DesktopPuzzle is a joke trojan that runs on Microsoft Windows operating sytems.
Once launched, the trojan will display the following message:
Oops, looks like someone doesn't like you very much! You have to finish this sliding tile puzzle before you can continue whatever it is you're doing! Use the cursor keys to move the pieces [black piece is the empty one].
It will randomize the user's screen into a sliding puzzle, and the user would supposedly have to complete the puzzle in order to resume their work. The user can cancel it with Task Manager, however Task Manager will be blocked in Windows 95.