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Jumping Puzzle 4 - Back and Forth

PLEASE NOTE:
There is a bug with a blue gel dropper. I finally encountered it once myself, but never again afterwards in several reloads of the version available here in the workshop. Unfortunately, I have no idea what triggers it. Perhaps the map is too large and that breaks the gel code in some occasions? Anyways, if the bug happens in your case, please use "noclip" and just fly along the conveyor belt to the last door on its way. As of 2020, I'll perhaps split this map into its two major components as individual maps one day.

Warning: Requires puzzle solving and jumping! Please rate and (or) comment!
Please note: I am aware of a bug that is related to the autosaves I added to the map, causing counters (as in the preview picture) to start when you respawn. I'm trying to find a solution, but if you don't die, you will not encounter it ;-)

This is the 4th part of my Jumping Puzzle series. I highly recommend to play at least one of the previous maps before attempting this one, as they all share the same concept, but are much shorter than this map - so you know what you're getting into when attempting this map. You can find the previous maps here (or get the collection above):
Jumping Puzzle 1 - Introduction
Jumping Puzzle 2 - Conveyor Belt
Jumping Puzzle 3 - Detour

Estimated time to complete: 45 - 75 minutes
Difficulty: 8.5/10 - (very) hard

As the map image shows, this map does contain a special something to make your life a bit easier. Or it may have allowed me to make the map harder, who knows ;-) Jokes aside, this map is by far(!) longer and more challenging than any of the previous Jumping Puzzle maps, as it does not only contain parcours elements (which can be solved without ninja skills), but also real puzzles that require more than just jumping and path-finding. Overall, this map has some kind of adventurous feeling to it, as I put a focus on exploring on this map. You might notice a feeling of loneliness...

Need help?
In the (first) room with the conveyor belt, use the railings to reach the doors upstairs. That is, jump from a higher spot on the stairs onto the railings and walk on top of them.
Once you reached the second room with the conveyor belt (the room that contains an item dropper and only one observation room), use its button to drop a wood crate. Carry this one below the bomb dropper at the start of the map. You have to place the crate on the railing in front of the door of the observation room to get back up the pipes. With the bomb dropper, the crate can be destroyed to reveal its content: the portal gun.
With the portal gun, you can make your way to a room with a blue gel dropper. Use the gel to paint the conveyor belt and hurry back the second conveyor belt room, where you got the wood crate. There, you can jump on the conveyor belt that now carries blue gel to jump over to the other site. Few remarks: You will need one further bomb to destroy the glasses in the initial conveyor belt room. Also make sure to cover every pillar in the gel dropper room with blue paint, as it allows you to climb up without using your portal gun - and to jump from the highest pillar to the button that triggers the gel dropper. Also notice the white surfaces in the hallways between the rooms!
In the last part of the map, you will have to move through the gel dropper room again to make your way out. Having the pillars covered in gel also saves some time here.

Challenge: Can you get the companion cube to the exit?