Why Doom? Guillaume Lample and Devendra Singh Chaplot, the paper's authors, note that humans have already trained A.I. to learn Atari 2600 games, and games like Chess and Go, where all the information needed is immediately visible to all players. Doom, it turns out, more closely resembles the real world. Not so much the demons everywhere, or the scattered guns on every sidewalk and in every corner bit. No, what Doom offers is a 3D environment, and concealed information.