Quote from zivi7 on June 4, 2012, 9:43 am

Uh, ignore my first post, I should have read more carefully - thought you had played ONLY valve maps so far. Check jozepezdj's list, those are some tough ones. The toughest for me so far was definitely Nyskrte's Impetuosity.

Quote from Lpfreaky90 on June 4, 2012, 9:47 am

check out the coop maps from here too:
downloads.php?cat=14

Quote from josepezdj on June 4, 2012, 10:00 am

First ones that come to my mind:

Complexo by jonatan: http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1369

Nyskrte's:
Impetuosity http://forums.thinking.withportals.com/community-releases/impetuosity-t5298.html
Orb Facilit http://forums.thinking.withportals.com/viewtopic.php?t=4883&p=56647
Puffin http://forums.thinking.withportals.com/topic5646.html

10 reasons for reasoning http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1630

Course of Knallhart http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1212

Room of Raco http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1198

Quote from BEARD! on June 4, 2012, 10:33 am

Josepezdj has got it spot on. Impetuosity is well-known for being one of (perhaps the?) hardest coop maps on TWP. Puffin is similarly difficult, but fortunately not as extensive. My partner and I played Complexo a while back and were unable to complete it, that's definitely a thinker. 10 reasons received rave reviews, but I wouldn't say it was as hard as the others. I'm not sure I've played the rest, so thanks for those suggestions.

Quote from josepezdj on June 4, 2012, 11:30 am

Ey Beard, btw, was it you who create that map named "Search for Science"? (maybe your brother?? ) ... Because I think it's really awesome! It's funny, with the exact size / n? of chambers, an splendid difficulty balance... I got sincerely surprised man, good job. Just so you to know...

(Sorry if I post that here but to be frank, since the PTI, as some maps have their own thread but some others not, it's hard to make comments post video-playthroughs and such in the right place...)

Quote from BEARD! on June 4, 2012, 1:48 pm

offtopic
[spoiler]Yep, that was me! I cobbled it together in the beta, just as a test really! Thanks for your feedback, it's good to know you enjoyed it! There's a TWP thread here for what it's worth.[/spoiler]