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Reset

Hint: the name of the puzzle
Extra hint: yes, the name of the puzzle, because you have to Reset the cube

My solution: https://www.youtube.com/watch?v=0vZa_PGSjJI
Around 11 minutes to figure it out first time.
Techniques
respawning the cube to its original place after it's done its job elsewhere
disabling fizzlers one by one to bring the cube over
bypassing fizzlers with portals in the right sequence

Wow, This Hurt My Brain For Quite A Bit. Still Good Chamber

Revisited this from the "introductory" pack -- I remembered nothing about the solution (just the fact that it existed in my history), so re-solved it again, with fewer issues this time around I think... experience does pay off. :P

Really cool use of the track platform.

Too easy, I didn't even overcomplicate it ^^'

Semi-blindrun (at least 4 years since I've played, took a break starting from late 2019)

Remembered some of the key techniques so it's hardly really a blindrun, but it is fun. Very well-designed, aesthetic, and for the inexperienced, a good exercise in portal-management and "resetting". :P
Fun fact: Played Mercury just before this. If you see me waving my camera around wildly that's in reaction to a weird glitch I've never experienced before in which some of the sounds (namely, the portals and the cubes) seemed to have been "carried over" since they sounded like the P1 sounds. Maybe it has something to do with the fact I loaded both maps directly with the "map" command in the dev console.

Difficulty: 5/10 (much easier for those who know about cube sacrifice techniques though)
Design: 10/10
Enjoyed: 8.25/10

Perhaps the simplest demon arisen puzzle I've ever solved

I like that is uses an element I dont see too much,the track platform. In a pretty nifty way to! I liked this although I found it sorta underwhelming although it might be due to the fact the name gave it away Overall though, neat!

@bullfrog Hooray! Glad these older maps still stand the test of time :)

Still fun to play