The mysteries of Half-Life 3 and episode three of Half-Life 2 may never officially be resolved. Extensive, investigative work has resulted in little to no revelation, and whenever information does crop up, it’s delivered at the most unexpected times in the most roundabout manners.

Valve may have abandoned its silent theoretical physicist, but other developers have brought him into all sorts of video games over time. Freeman has received plenty of subtle textual and visual nods in titles like Call of Duty: United Offensive or Grand Theft Auto: San Andreas, so we’ve limited our list to actual sightings of Dr. Freeman’s likeness. Let’s see what other worlds the scientist has explored over the years.

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