Most computer games will take over the whole screen when you play but you might be able to open them in a regular window. Here how. Not guaranteed to work for ALL games! ** ======= Options ======= 1.) Alt + Enter 2.) Backspace 3.) F12 4. Game launch options can be used to change game settings before running the game. Launch Close the game's Properties window and launch the game. Justwannaplay View Profile View Posts. Here is a short selection of wrappers for you to try out:. The most common launch options are listed. Home Discussions Workshop Market Broadcasts. Game launch options can be used to change game settings before running the game.