I just tried to run portal after not playing for a while and I failed hard.... Keep up on your games...

Are runs invalidated if I edited VTF files to make the textures on cubes, buttons, doors, turrets, cameras, and portal gun different?

Also, if I used the "Portal Tools" tool listed in the resources tab on this site, does that ruin the run?

Thank you so much for the clarification! I was totally stumped.

So, I just recorded a run, and am trying to submit it, but it asked me if it's RTA or SS, and I have no idea what my run is. What's the difference, and how do I know what mine is?