Portal 2 play coop over lan

play coop over lan:

1) Enter the game one both computers and Enable Developer Console in the options.

2) Hit " ` " to open the console. Then type in... sv_lan 1.

3) The client should connect first as it disconnects if the host is in the empty game for a few seconds, but the client can wait forever.
Client: Type into the console... connect replacing the <> with an ip.
For example... connect 192.168.1.3

4) Host then selects the map by entering into their own console... map mp_coop_ replacing the <> with the name of the map of choice listed below.
For example... map mp_coop_start

5) The host will connect and the client will see the blue bar fill, finally entering the game.

Map List (In Order)

"mp_coop_start"
"mp_coop_lobby_2"
"mp_coop_doors"
"mp_coop_race_2"
"mp_coop_laser_2"
"mp_coop_rat_maze"
"mp_coop_laser_crusher"
"mp_coop_teambts"
"mp_coop_fling_3"
"mp_coop_infinifling_train"
"mp_coop_come_along"
"mp_coop_fling_1"
"mp_coop_catapult_1"
"mp_coop_multifling_1"
"mp_coop_fling_crushers"
"mp_coop_fan"
"mp_coop_wall_intro"
"mp_coop_wall_2"
"mp_coop_catapult_wall_intro"
"mp_coop_wall_block"
"mp_coop_catapult_2"
"mp_coop_turret_walls"
"mp_coop_turret_ball"
"mp_coop_wall_5"
"mp_coop_tbeam_redirect"
"mp_coop_tbeam_drill"
"mp_coop_tbeam_catch_grind_1"
"mp_coop_tbeam_laser_1"
"mp_coop_tbeam_polarity"
"mp_coop_tbeam_polarity2"
"mp_coop_tbeam_polarity3"
"mp_coop_tbeam_maze"
"mp_coop_tbeam_end"
"mp_coop_paint_come_along"
"mp_coop_paint_redirect"
"mp_coop_paint_bridge"
"mp_coop_paint_walljumps"
"mp_coop_paint_speed_fling"
"mp_coop_paint_red_racer"
"mp_coop_paint_speed_catch"
"mp_coop_paint_longjump_intro"
"mp_coop_credits"

The current map name can be found in the console after it loads (for continuing at a later time) but all gestures earned will be lost, as if anyone cares.
Note that they may reroute you to the "mp_coop_lobby_2" multiple times in which case you just have to restart the process for the next level.