yoda said:if it was copy writed then no....
Best thing to do is to email the author and ask them....
I can't see a problem provided your not making people pay to play the game.... BUT ASK ANYWAYS!
:edit
however, saying that.... if your only using the program for yourself and your personal pleasure then as long as you don't put it on a public server then they wont know about it....
Craig321 said:Hmmm, would be a bit of a hassle emailing every author and asking them especially if I wanted to make a large online arcade or something.
Maybe if I edited games that didn't actually say copyright on them?