Portal | Underground story This Portal story is based on the MTN Portal Story | Part One! This mappack includes around 75 levels. in this mappack have Project One, Project twO and a Training room for Project twO.

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3 AD_79

Aug 12th, 2013 0 people agree 0 people don't

Simplistic and uninspired level design, misaligned textures, lack of custom voice files and an overall boring experience make Portal: Underground Story one of the worst mods for this game.

googoobla42 says
10 googoobla42

Jul 16th, 2011 0 people agree 1 person doesn't

Fun gameplay and ideas for the puzzles, keeps me interested even when I'm bored. A lot of glitches though, but it doesn't matter.

Tildch says
8 Tildch

May 23rd, 2015

No review provided

mtz says
8 mtz

Aug 5th, 2013

No review provided

stampp says
9 stampp

Jul 15th, 2012

No review provided

mentat0 says
10 mentat0

Mar 9th, 2012

No review provided

loudonlune says
10 loudonlune

Oct 27th, 2011

No review provided

LucasSM13 says
10 LucasSM13

May 24th, 2011

No review provided

Mattey says
10 Mattey

Apr 13th, 2011

No review provided

SenorGrande says
8 SenorGrande

Mar 12th, 2011

No review provided

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