Okay, this issue is common and easy to fix. In fact, you have to download the "Portal: Prelude 2013 hotfix/patch (1.1.5)" from the Portal: Prelude download page here : http://www.portalprelude.com/download.php Then you have to follow the instructions. This is fast. You have to extract the "gameinfo.txt" in the portal prelude folder. This will replace the ancient one.

Do you have a white screen when starting the game ?

Ok great, thanks for paying attention

Indeed, but I think the "Buy all two shops" or "Wake Up the third vault" could be added in misc categories.

Hello everyone,

I am rather talking to the moderators of this game, but if you want to let your opinion here, then you are welcome. So I am here to suggest you a new speedrun category for this game, as said in the title. Currently, every categories here are based on the story mode, but not on the speedrun mode, and I think that could be interesting to add categories about the speedrun mode, because it takes a non-negligible part of the game. So maybe it could be at least interesting to add each speedrun mode level in the individual levels section, and even maybe add a full-game category which consists to finish every speedrun mode levels in a row as fast as possible. How do you think about this ?

Sincerely yours, Xorven

Steam was closed already, and yes I'm gonna try to launch the exe from the file. Thanks

Hello everyone, I have installed the game yesterday. Yesterday I was testing this version and set everything. It was fine. But now since today, I have randomly this error message while playing : (if you prefer it's the 'there is no disk' error) It is really annoying for my runs and I really would like to remove this, but I don't know how. Could you help me please ? Sincerely yours, Xorven