By Marty Mulrooney
Alternative Magazine Online reviewed Portal 2 in 2011, describing it as “one of the greatest video game sequels ever made.” Valve Corporation has now teamed up with small record label Ipecac Recordings to release Portal 2: Songs To Test By (Collector’s Edition), a physical 4-CD collection of the award-winning music of Portal 2 (with previously unavailable music from the original Portal featured as an added bonus).