id a US$100,000 payment on the project. Mark Rein, who had been brought on a few months prior as id's probationary president, also sold the idea of doing a retail Wolfenstein project to FormGen, which had published id's December 1991 Commander Keen in Aliens Ate My Babysitter, overcoming the publisher's concerns over Wolfensteins proposed content. This put id in the unique position of selling simultaneously to the shareware and retail markets. The project officially began on December 15, 1991. Romero and Hall designed the gameplay and aesthetics. Romero wanted the goal to be "to mow down Nazis", with the suspense of storming a Nazi bunker full of SS soldiers and Hitler himself, as well as dogs, blood "like you never see in games", and straightforward, lethal weapons. He also composed the general storyline for the game. Hall designed the levels while also adding collectible objects in the form of treasure and food for health items. He also did sketches for the bosses and the title screen. Carmack programmed "the core" of the game's engine in a month; he added a few features to the Wolfenstein 3D engine from Catacomb 3-D, including support for doors and decorative non-wall objects, but primarily focused on making the game run smoother and faster with higher-resolution graphics. The game was programmed in ANSI C and assembly language. The graphics for the game were planned to be in 16 color EGA, but were changed to 256 color VGA four months before release, which also enabled the game to have higher resolutions. Romero in turn worked on building a game with the engine, removing elements of the initial design, like looting enemy bodies, that he felt interrupted the flow of fast gameplay. The sprites for the enemies and objects were hand drawn at eight different angles by Adrian Carmack using Electronic Arts's Deluxe Paint II. Initially the team had an external artist who assisted him and created animated wall textures, but the team felt that the quality was poor and did not use it in the game. The level design, by Romero and Hall, due to the grid-based level design, took some inspiration from Pac-Man, and paid homage with a hidden Pac-Man level. Romero later said in 2017 that making the levels was uninteresting compared to those from Commander Keen and had to prompt Hall to finish the maps with the promise of being able to buy