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Jazz Jackrabbit 1 doesn't have a Home Cooked Levels menu, and even Jazz Swapper requires you to pay attention, so the entry work of playing custom JJ1 levels has always been kinda high. Thanks to the js-dos library, though, I've implemented a mod loader for JJ1 that you can play in your web browser. Play any custom JJ1 level/s uploaded to J2O (or the JJ1 shareware demo) without needing to download files, install emulators, or spend money.

(All levels have been been modified where necessary to run directly from the first episode instead of replacing some random level in Letni or Megairbase or whatever.)