What is the difference between the standard coop and challenge coop?

[A_Lonely_Potato]

As stated above, i am wondering what the difference is.

[GLITCHGAMER12]

I beleave the difference is that standard coop has a set of levels and challenge coop is you choose a certain map or something like that

[Chillu]

Standard co-op is basically normal walkthrough, challenge co-op is time based (speedrunning). You can see the leadberboards for Co-op here:
https://board.iverb.me/chambers/coop

[A_Lonely_Potato]

Ok thank you both.