http://www.youtube.com/watch?v=R2ybeWAD7Hg

Maybe through a fizer so you can't take ball/cube with you.

Geneosis, thanks for playing my map! :D

I don't remember exactly but i think that this new piece of porlable surface could ruin my testing chamber somehow. I'd better make something like a safety path to the main part of the chamber!

Thought you would like it Geneosis, I am uploading the video for your map and have recorded a video for this map. takes ages at 30kbps

Wow, really cool chamber you have there! I thought a moment that opening the exit was really impossible XD But I finally got it ;) Good work ^^
Anyway I found a place where you can get stuck if you accidentally place the 2 portals there : The area where you get the ball ^^" I suggest adding some white surface on the ceiling with a fizzler under it to allow the player to come back to the main part of the puzzle if he fails like that ;)

Why not, It would be a helping hand for those who failed solving it! :)

this is a very very hard map. I made it throuh in the end though. If i made a video, would you put it up in the image section?