Changed description to reflect this being a bugged version with the update released as a separate patch. 5667 contains the functioning reworked patch, which was made in the more functional DSPRE while this one, 5657, was made in PPRE which is prone to making bugs. This page can be deleted as needed.
The dreaded Iggy Koopa has broken away from the Koopa empire and decided to gather his group of Koopa rebels into a vast army to take over the Mushroom Kingdom, rather than Bowser’s rather uninspired and overused plan to simply grab the Princess and hope for the best. Mario has heard of the plan from a mysterious source and will now infiltrate Iggy’s domain to assassinate the son of the king of the Koopa.
Essentially, this is an SMB1 hack with an SMB3/SMW graphical style. There are three challenging sections to complete to get through Iggy’s domain and almost everything has been changed in one way or another.