That final bit was fantastic- one of the best chambers I've ever played.

That was a brutal level.

Played this 10 years after you made it. Great map!

my brain was broken like that room at finalle, but damn i made it. it takes me so much time. Good puzzle. It takes from you to think widely

This was so hard but so good

Great map! That ending is a real head scratcher, loved it!!

That was great, but what was the purpose of the light bridge in the third room? I spent ages with the cube in that center bit, trying to work out what I meant to be doing, and then in the end I didn’t even use it lol. Was it just there to throw people off?

The more I look around YT playthroughs (including Selyp's one you linked), the more I realize my solution for the finale IS the intended way, and there probably can't be any other. A great finish.

Just when I thought I was done... I wasn't done, LMAO. Not sure if my solution to the third puzzle and finale was the intended one -- I never used the light bridge in the third puzzle, and the way I did the finish was uncharacteristically wacky... but very pleasantly wacky. Hats off if THIS was intended!

I do maintain my disagreement with the "prop a cube off a button via a light bridge" trick, but here it was fairly obvious that it's the only way forward, so since I knew it was a thing you can do, it didn't bother me too much.

The other issue is that you can softlock yourself if you try to reuse the light bridge from puzzle 2 in puzzle 3 and then remove it , if you've also left the laser grate on, I don't think you can get out in any way after this.

Those two are my only criticisms, and they're minor ones, best map in the series so far, here's hoping 5 and 6 don't let me down. Excellent work!

Replayed this one after six years, still awesome. Couldn't remember ANYTHING, but my thumbs up didn't lie ^^ great outside the box ending. Maybe a little misleading with the other beam. I pulled my hair out because I wanted to know if a cube swap in and out of the third room was possible. I even was close to stumbling into a softlock situation when I reused the light bridge from room #2 in room #3... but that's a minor criticism.

HOLY S*it!!!
THiS was so awesome and clever!
That ending melted my brain... the best user puzzle i played so far.
And i played alot!

Fun map

cool map, really tough ;) I did it finally without help!
Happy to solve it

That last part took me over 1 hour. When I finally figure it out I wasn't sure I had the intended solution.. then I saw the playthrough and it was the intended solution, crazy as it seems. Never seen a map that forced the player to go through all that in the end (no spoilers). Really well thought out.

Okay, so usually I only like (as in, thumbs up) tests that I don't have any complaints about, but besides my usual nitpicks, this test just melted my brain with its solution. Per usual, this test was very well decorated. And the tense parts (ie. the glitchy elevator crash) were tense.

Thank you for making it!

Amazing. The solution to that third cube was just elegant.

I racked my brain and realized I was looking at the solution all along

clever

@Sloi Thanks! Glad you enjoyed.

This may be one of the best parts of 2020.

Great map, medium difficulty (20-25 min solve) but definitely in the same class as mevious/gig/azorae/etc.

Woah that was hard, but also brilliant! Thanks for the experience

Ease up a bit, this one is very hard indeed.

This has to be one of the best chambers i've ever played! thank you for making my week!

Brilliant puzzles! This one was much harder than the prior ones. But I figured it out fairly quickly. Was a bit unsure how to do the final part, but it slowly unfolded. Great satisfaction. This map and map 0 are the best ones. Haven't played any of the later ones though.

I loved solving this puzzle, THANK YOU VERY MUCH.
I put it directly in my favorites

Probably the best map I've ever played. Took me forever but finally figured out the last step ;) Brilliant design!

very cool map, brain felt good afterwards.

That final puzzle to get the excursion funnel. Damn good puzzle.

Nice test I almost finished it, just didn't get that cube change part at the end without youtube tutorial.

very excellent!! love the ending!

Yowza! This was quite the challenge. Accordining to the comments left by others, I didn't solve it the intended way. But like pilots say, any landing you walk away from is a good landing. The intended solution is more elegant than mine, but I'm still quite satisfied I reached the exit.

Clever! Didn't expect so much action =)

Oh. My. Gosh. 2 HOURS!!! I finally managed to solve the final step by looking in the second room... Took me 30 minutes to figure that out even with help from the comments. Thanks for making this map.

That is an evil (yet very clever) trick... Kudos.

Very cool map! Here's my solution
https://youtu.be/YcH91uItZjQ

Affter a week I finally figured it out. LoneWolf2056 is an evil genius.

Still cant figure it out, and I'm at the last step.

This is an evil chamber. I have trapped myself in the last area twice now.

What a fantastic puzzle!

This was one of those levels I felt proud after solving! Great puzzle!

wow awesome. very clever puzzle.

that was so good!!! i have been swoocing right through some so-so test chambers, but this one was such a good challenge. ^u^

I like it, however took me a some time to decide the last step.

Excellent!

Funtastic!

Now that was just plain cruel. Love it! :)

Excellent tricky hard map! Thank you @Selyp!

I remember playing this one long ago. Nice and difficult, I like it! Thanks!

Oh my dear God that was so hard. Bravo indeed

This is a Portal masterpiece. Bravo.

I've been going through the Dilapidation series. Haven't played Part 5 yet, that's next. Part 4 has the perfect level of difficulty for me. I was stumped a couple of times, yet resisted to look for a walkthrough. The earlier ones weren't as hard in my opinion.

Thanks for making these, especially this one. The puzzle was incredible, but also the artistry and surprises. Definately a favorite.