Editing a game
From The Tic-Tac-Totality
When in doubt, do it: you're not making any permanent changes, you're just adding a new version. But remember that, while it's easier as an editor to ask forgiveness than permission, it's also easier for a creator to revert than argue. So the more substantive your changes are, and the more you want them to stick, the more likely it is that you should bring it up on the game's discussion page.
Any user of this website should be sure to read "10 Things you did not know about Wikipedia"; while this site does not function in an identical fashion, it is built on the same basic principles and software.

