EDIT. OK, I know how to prevent it. Update is coming tommorow.
[SP] Banzai !!!
The whole conception of this puzzle is a remote control of the cube. The intended solution doesn't require pushing the cube or the like.
And I must admit now it looks a bit confusing.
Here's the demo of my solution...in 5 parts.... Pain in the ass to execute, but clever. Let me know.
Banzai.zipWas it realy to much pain to execute? How about the other tasks? 
Good chamber! I usually dont like custom content, but I liked the new field and i especially liked the electrified cube. The restrictions are logical and make for some interesting solutions. Well done!
Nice work.Definitely some near-ninja moves required though. I may have made it tougher on myself by using several different methods than HeadShot - I didn't get the cube anywhere near the catapult in room 2, skipped the dual catapult step in room 3, and struggled with turning gel near the end. (I might make some demos later.)
I think I had more fun in the bts area.
But I'm still not sure how a large bottle of beer is supposed to make solving the main puzzle easier. Wouldn't it have the opposite effect? 
Calmly Frenetic wrote:
But I'm still not sure how a large bottle of beer is supposed to make solving the main puzzle easier. Wouldn't it have the opposite effect?
Haha, don't worry it's already empty. I think when it was full it was heavy enough to press the button, but alas, you're a bit late.
Greykarel - another amazing piece of puzzle making skill. Thanks for creating - even though I couldn't solve it...
I watched Headshots demos and I solved it a little diffrent,
Sadly I have huge performance drops with gels and my solution requires very tight timings so I can't make a video.
I never used the blue gel at the upper area so it took me ages to find a solution for the last part.
I painted the start area so I can jump up and shoot a portal back to the wall with the lasergrid...
Then with tight timings and some crazy jumps I managed to drop a respawned cube on the button again while having blue gel inside the funnel.
Maybe I can record you a demo if you want.
Had much fun in this one... 5/5
http://youtu.be/S3nx4Vgb8mw
Now, who is gonna show me anything behind the scene? 
greykarel wrote:
Now, who is gonna show me anything behind the scene?
This map was sitting in my queue for several months, silently taunting me that it still had hidden secrets.
So here is a video of the other two tasks, to complete the set.
BTS & side quest alternative solutions
http://youtu.be/dsUBKE64cu8
I chose what I think is the cleanest way to achieve the side quest, after trying some faster routes that were less elegant and less reliable. To add some balance to the video, I broke the first room instead. 
And I really wish the music would keep playing while in excursion funnels.

Thanks for playing it hard.
P.S. I wish I knew how to keep music playing while player is in funnel. 
Totally as intended by Grey
And you found the side quest, which I never did during the beta!
Cheers for that! There's still another way to get to the easter egg that I found while testing the map and that Grey kept as alternative. I recorded it:
EDIT: The music in the map sounds good, so I looked up an instrumental version of "Waiting for the night" to use in my own map. It sounded a bit different, so I extracted the file from the BSP, and itseems like you edited it?