World 7 of Super Mario Bros. 2 (and in turn the original Doki-Doki Panic) only has 2 stages instead of the standard 3 used for stages in the rest of the game. This is due to the plotline in the manual of the original Doki-Doki Panic, where the final page of the book the twins were teleported into was torn out. This detail was not given an equivalent in Super Mario Bros. 2's plotline, and even in the original Japanese release was not mentioned in-game, and as such could come off as an oddity to players of the original version too should they not read the manual.