Double Fine’s Devs Play series features classic games played by experienced developers. In the most recent episode, John Romero walks Double Fine’s JP LeBreton through the first level of Doom.

During the 15 minute session, Romero explains how id Software created visual variety using horseshoes, the importance of looking outside, and how secrets in id games evolved. Romero and LeBreton also discuss scale and scope of hallways and how subtle angles can impact the player experience.

You can check out the full series on Double Fine’s channel. For more Doom nostalgia, check out images of the original models used in creating the iconic characters.

[Source: Double Fine via Polygon]