Difficult Maps
I'm looking for some difficult puzzles and want suggestions regarding such custom maps that I could download.
I've already looked into jonatan's awesome maps and will be keeping an eye out for his new stuff, but I would also like to download maps of that level (of difficulty) made by other users as well..
Thanks in advance.
Nys series 1 to 5 are hard give them a go.
EEEEyyy.... WAIT! My favourite subject!
Yeah Nys-Series are AWESOME... you'll have a loooooot of fun if you like that kind of challenging maps. Also, if you already know jonatan's maps, my remaining recommendations (at a first shoot only... I'll post more when I remember them...) would be:
1. Engineer (by Ruien)
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=701
2. Chander's maps:
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1251
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1222
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1261
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1331
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1360
3. Omnicoder's maps:
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=617
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=508
(of course, check out for Portal 1 maps as well)
4. Damagepy's maps
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=659
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=330
(of course, check out for Portal 1 maps as well)
5. InvisiblePanda's maps:
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1364
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1090
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=705
6. Vengeance (by satchmo):
http://forums.thinking.withportals.com/community-releases/vengeance-t3934.html
7. Blue Walls (by RubyCarbuncle):
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=694
8. Portal Raider Toxic (by Haggis):
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1248
9. Bridges to a new tomorrow (by Zhan):
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=706
10. Aperture Experimental Labs (by doubledispatch):
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1249
11. Delta Bunsen! (by Lobster)
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=729
Some of above are just tricky, not necessarily hard, but you will sure like them anyway. Others are REALLY difficult maps.
Wait your comments!
EDIT: all of them are SINGLE player maps... I've played many coop with a good level of difficulty... Let me think of it and will post them shortly.
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]
My "ML Combination" and "ML Halloween Trick" are somewhat difficult. A lot of people liked "ML Halloween Trick" Here's a link to it: http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1343
My Work
[spoiler]Maps:
Revenge of the Angry Turrets
Capture the Cube [Co-op]
Capture the Cube 2 [Co-op]
TPWEGTH Sample Map
Aperture Aquatic Testing Center
Aperture Aquatic Testing Center 2
Aperture Time Testing Center
ML's Halloween Trick - 1000 downloads!
ML's Halloween Treat
ML's Combination - 1000 downloads!
ML's Jailbreak Labyrinth
ML's Tricky Teamwork [Co-op]
WIP:
"Capture the Cube 3"
Workshop Maps Link: http://steamcommunity.com/profiles/76561198008890579/myworkshopfiles/[/spoiler]
check out this thread too.
I think in terms of boolean variables. Generally, it makes things easier.
Damn, I forgot one of the best ones!
(Mi amigo Carlos me va a dar en la jeta!)
PSICODELIA by Carlymx:
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=1000
useful tools and stuff here on TWP [spoiler]
[/spoiler]Thanks a lot, josepezdj, I'll look into them.