The top 10 video game Easter eggs of 2013

Check here for more from GamesBeat’s 12 Days of the Best and Worst of 2013.

Every year, game developers hide secret content in their titles for eagle-eyed players to find — like John Romero’s severed head  in Doom II, the elusive “green ninja ” in Mortal Kombat, and a creepy half-naked man  in Halo 2. 2013 is no exception.