Kaizō Mario 2
Rather than being an imitation of the infamous Kaizō Mario World hack, this is merely a hack with all new levels for Super Mario Bros. 2. Not intended to be ridiculously challenging, but a much needed expansion for people who have played the original game to death. Experienced players should find this to be challenging, but not insurmountable. Abstaining from the use of save states is encouraged.
It should be patched to a ROM with md5
xdelta -d -s smb2j.fds kaizoumario2.xdelta kaizoumario2.fds
If you're playing on an Everdrive N8, make sure you're using a firmware version that loads disks correctly, else you will be stuck on the black loading screen after WORLD 4-4.
Thanks to ALXR for creating jGreatEd, the tool I used to create this.