We recently gave you our selection of the best Portal 2 single player maps and campaigns available on the Steam Workshop. There's some great feats of level design in that list, but if you really want to see mapmakers skills stretched to the limit, you have to turn to co-op.
With two brains and four portals available, the levels must be exponentially more complicated. They need to emphasise teamwork, provide an inventive challenge and be tightly crafted so as to stop players exploiting their way through. With that in mind, I enlisted the help of my Perpetual Testing Partner to dig out the ten best co-operative maps around. As always, if you've a favourite that's not listed, let us know about it.
1. Six Extra Seconds of Trust
The title refers to this Cave Johnson sales pitch for co-operating robots. It's apt: Six Extra Seconds of Trust takes place in a room full of buttons and switches, with each player on either side of a glass wall, trying to figure out how to help the other. The work gone into creating such a labyrinthian series of connections is truly impressive. Download Six Extra Seconds of Trust here.
Notes from the Testing Partner: "I've got it! Just take that cube to... wait... no. That won't work for all sorts of reasons"
2. Buttons, Elevators and Goo
...And funnels, lasers, jumping puzzles, blind leaps of faith and those damn emancipation grids. B,E&G contains a large room full of corridors and side-chambers, each concealing a cube needed to complete a collection of buttons. Each area contains or requires a different puzzle element, and its the variety of challenges and their enjoyable solutions that make this a great map. Download Buttons, Elevators and Goo here.
Notes from the Testing Partner: "NOOoooooo..! *splash* Balls."
A clever little chamber comprised of two rooms, one on top of the other. While neither player can reach the other directly, laser guarded holes in the ground allow you to share the limited resources back and forth, and buttons allow you to deactivate obstacles in your partners way. There's not much portalling to be done, but co-ordination and teamwork are still key. Download Camtasia here.
Notes from the Testing Partner: "I'm stuck in this hole again. :("
4. Fortunate Buttons
A super-contained single room challenge with plenty of black walls blocking your progress. Fortunate Buttons is an order of sequence puzzle in which every step seemingly throws in more complications and leaps of logic as you move towards your solution. It always feels like you're on the edge between completion and completely messing it all up as you attempt to stretch a limited number of cubes further than seems possible. Download Fortunate Buttons here.
Notes from the Testing Partner: "Just go and- NO, NOT THE FAITH PLATE! Idiot."
5. There's No I in Team, 01
Part of a series of co-op maps made by mapmaker LPChip. Part one starts with a tricky excursion funnel challenge that requires you to really think through the positioning of each player before you make a move. But it's the finale, in which you share a sphere back and forth between each other, that really exemplifies the "accidental" comic slapstick at the heart of the the best Portal 2 co-op maps. Download There's No I in Team here.
Notes from the Testing Partner: "I know how to do this! I have to die!"
Hit the next page for more vents, ramps and tactical suicides.
6. Co-op Vents
It's pretty easy to complete, but there's a lot to like about Co-op Vents. You and your partner split off into two separate corridors (or vents, I guess), which intersect at rooms designed to put one player's life in the hands of the other. The difficulty lies less in the puzzles themselves and more in resisting the urge to blow up your friend. Download Co-op Vents here.
Notes from the Testing Partner: "What is it about lasers that turns you into a homicidal maniac?."
Rampage heavily explores the possibilities of hard light bridge based puzzling. The three rooms use a mixture of ramps, bridges and emancipation grids to create interesting and unique challenges that require some seriously involved portal co-ordination. Also smart: It allows respawned players to easily make their way back to where they died. It's a problem in some maps, thanks to a level editor that doesn't allow checkpoint placement. Download Rampage here.
Notes from the Testing Partner: "Wait, STOP! Not yet! *splash* DAMN IT!"
8. Quest for the Edgeless Safety Cubes
In which you must find three spheres to unlock the exit, each hiding behind some difficult puzzles in sub-chambers that themselves can be hard to access. The main puzzle room is full of buttons and laser-activated switches, and just deciphering what controls what is a challenge. Despite that, the level has some well crafted puzzles that require inventive portal work to complete. Download Quest for the Edgeless Safety Cubes here.
Notes from the Testing Partner: "I meant to die there. It was tactical."
Mazed casts you as lab rats, working through corridors looking out onto a large, unreachable cube. Each player must help the other to progress through their respective routes. What at first starts out as simple switch activation soon becomes an involved series of timing challenges and backtracking in order to make a small bit of progress. It's a strangely claustrophobic experience. Download Mazed here.
Notes from the Testing Partner: "I should have picked your route. There's less pissing about with turrets."
10. Super Happy Fun Time
Finally, a one room puzzle that features lots of thinking through the use of an excursion funnel as it pushes and pulls cubes and players through four portals and a variety of improbable obstacles. The division of labour is a bit off balance, with one player required to do little more than push buttons at the right time, but the central problem requires plenty of discussion to overcome. Download Super Happy Fun Time here.
Notes from the Testing Partner: "Sure, the bit with the funnel was fun. But super happy fun?"
Bonus: Geolocity Stage 2
As with the single player maps, some creators prefer to use Hammer, the Source engine's level editor, to create more detailed works. Hammer's co-op selection is less focused on custom campaigns than the solo stuff, but its use still enables handy additions like visual variation and player checkpointing.
It can also be used to reimagine Portal 2 as something else entirely. Something like a racing game. Geolocity Stage 2 abandons puzzles for a track covered in orange speed goo. You have to run, jump and portal your way through the course, avoiding plenty of obstacles and thinking on-the-fly to get through some tricky sections as quickly as possible. While the first Geolocity is also a lot of fun, Stage 2 adds in the ability to screw over your opponent with targets that, when activated by the ping tool, can reverse excursion funnels, create barriers or activate crushers. Download Geolocity Stage 2 here.