Half-Life: Blue Shift review. Classic Game Room presents a CGRundertow review of Half-Life: Blue Shift for PC, developed by Gearbox Software and published by Sierra Entertainment. Blue Shift is the second standalone add-on for the original Half-Life, and unlike its predecessor Opposing Force, it returns to Half-Life in a more limited way. While it still stands alone as a great game, Blue Shift ends up being a disappointing step back after Opposing Force. This video review features video gameplay footage of Half-Life: Blue Shift for PC and audio commentary from Classic Game Room's Tristan.