How to close window/app when i cant see it? ubuntu

How to close window/app when i cant see it? ubuntu Im running ubuntu. I just tried to play supertux but my LCD didnt support the resolution and all i got was a blank screen and music playing. I tried to close it and go back to the desktop by pressing ctrl + z but that didnt work so i had to hard reset my computer!
Asked by: Guest \| Views: 324

Total answers/comments: 1

Comments display order:

bert [Entry]

ctrl+alt+backspace will kill your X session and restart is, dumping you at the login window.