[SP] Somewhere Underground 2
Better than the first, keep going that way 
7Yw_nmPOdH8
(Link: http://www.youtube.com/watch?v=7Yw_nmPOdH8)
Portal 2 Playlists: videos 1-200 | videos 201-400 | videos 401-600 | videos 601-800 | videos 801-1000 | videos 1001-1200
Good mapp and nice environmental, but have you looked at you map with command "Mat_leafvis 3"
that command show areas there you may be and to give it some info on if you what you may see. More info at https://developer.valvesoftware.com/wiki/Visleaf . I have worked on geting the areas to be bigger and more rectangle to do the math more easy to calculate, and by then reducing my build time for normal build by 50->max 3 min 
what i did was that any thing that is small but many corners or things i can see through i made func_detail that do that it is always rendred if you can see the visleaf that it is in. ( my home made cake in Ka Level 1 took 30 min less to build then func_detalj.)
se also for good info: http://optimization.interlopers.net/ind ... pter=intro
This map was better than the first I think. A little dark in the beginning even with the light source. However, very interesting and fun to play. Of course I love the train and the train sounds. Too bad at the end we didn't go on until we made a stop! LOL. Every element worked fine and direction was clear. Good work keep it up - longer one next time please! Let's get on that train and see where it goes!
Wandering around in the dark is probably my least favorite motif. These two are a little better than the first two in the puzzle department, but they just don't work for me in the looks department. 3/5 from me.
In my comments about the first maps in this series, I suggested picking an era and sticking to it. You went the wrong way; anti-gravity fields are way out of place here.
For some reason, the train door didn't open for me. I even went back and got another cube. I used it to jump over the railing, then got stuck because the player_clip wouldn't let me back up on the platform.Stuck in the tunnel
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Better then the first map yeah.
Like the train idea a lot, and as in the first map the light thingy is neat !
One again, coming from playing the third. This is much better than the first, some nice puzzles in this one.
I liked this map too. Rather enjoyed the puzzle elements.