The iconic FPS games from Raven Software and Bethesda, Heretic + Hexen, are available today for $15 on the Nintendo eShop. The games, which were built on a modified DOOM engine, were released in 1994 and 1995, pushing first person shooters into bold new territory. There are a total of 117 campaign maps and 120 deathmatch maps in Heretic + Hexen. You can purchase the bundle on Nintendo eShop.
