the leftover level E2M5 displays the message: "YOU'VE DONE IT!!" which never appears in The Ultimate Doom. Likewise, the episode intermission text displayed upon completion of E3M5 reads: "WONDERFUL JOB!", and that displayed upon completion of E4M5 reads: "FANTASTIC" again neither of which ever appeared in the original game. Charles Jacobi has said that there were never any plans to produce more than five levels and that he knew Scott Holman, another programmer, ran through the text strings and changed any that seemed inappropriate, without knowing where they went. The skins for the more difficult enemies from Doom have not been converted as these enemies were not employed in Chex Quest levels, but rather the skins have been removed entirely. This introduces an additional experience for those playing the "leftover levels" as these difficult enemies still exist in a completely invisible form. This also goes for items like the partial invisibility, berserker pack, light amp goggles, and all skull keycards. In addition, the music from the original registered Doom as well as the overworld graphics (depicting Gigeresque scenes of death and hell) and maps that were not modified (E1M6 through E4M9) were left intact, allowing anybody with WAD file editing knowledge to create their own copy of registered Doom (specifically The Ultimate Doom). Reception and legacy On release, the game was received largely positively by players. Consumers of diverse ages gave enthusiastic feedback, and there were many requests for the development of sequels. Corporate sales of Chex cereal also saw a tremendous boost with incremental volume over base increasing by 295% and volume share increasing 48% from the previous year. These increases were directly attributed to the release of Chex Quest, and General Mills deemed the promotion "highly successful." Although the promotion only lasted 6 weeks, the game continued to be played well beyond the promotional period and promotional marketing groups considered the brand image to have been revitalized "from old-fashioned and stodgy to exciting, fun and modern." Despite this, what little critical attention Chex Quest received in the video game press tended to be negative. Comparisons of the game to its forerunner (Doom) and to other similar games of the day were often unfavorable to Chex Quest, which was pejoratively labeled a "Doom clone", and the game was regarded as an imitation with little to no innovation. Noted cereal scholar Scott Bruce decried General Mills' decision to invent a