So I've been musing on bonus levels a bit.
I'm thinking of splitting them into three categories:
1) Reused names from MAGL X 1 and 2 produced by Horikawa's name generators.
These would be the most obvious of the bonus levels. Maybe they're made accessible through alternate exits, maybe they open up when you finish a world. Maybe they're all in one place (the "Recycling Center"?) and you unlock them when you get enough stars or something. Whatever the specifics, the basic idea is that they're designed to be easy to find and to be played over the course of the game, so there's a more varied difficulty range. Some of the earlier ones wouldn't be much harder than regular levels. Mostly I want to do it this way so there's no particular expectation on how hard these have to be. Plus, if a level gets made and turns out to match the name of a MAGL X2 level, it won't be too complicated to recategorize it.
2) Level names from MAGL 1 and 2.
These would be weirder levels, hidden in an equivalent to Zebraspace. In general they'd probably be harder than the first set.
3) Level names from MAGL X 1 and 2 that didn't use the name gimmick, either due to ignoring it or due to being postgame levels or something similar.
These would be postgame, so top-tier difficulty and probably also some of the weirdest levels in the game.
Of course, there's also the possibility that we'll get some extremely difficult levels with rejected names - A Deadly Dreamland Level is already very, very hard, for instance. We could accommodate that by having two "postgame" worlds - one is unlocked after beating the game (so the "ending sequence", however silly and inconsequential it ends up being, can be seen by most players) and the other, with the non-generated names from previous contests, would be for getting 100% on the rest of the game.
I'm not dictating any of this, of course; just tossing it out there to see what people think. One thing about this way of doing things is that it expects a minimum number of bonus levels in each category, but we can just worry about filling those out once we have the main game mostly done.
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Make levels from unused MAGL X names!