Mario vs Mouser (Chapter I)

Mario vs Mouser is a ROM hack of SMB3 where, as the title states, Mario fights mouser from SMB2. It can be found by doing the Konami code on all NES Masterpiece Edition. All worlds end with a mouser boss fight.

World 1 (Subcon Plains)

 * World 1-1
 * World 1-2
 * World 1-3
 * World 1-M (Pink Ear Mouser)

World 2 (Dream Desert)

 * World 2-1
 * World 2-2
 * World 2-3
 * World 2-M (Green Ear Mouser)

World 3 (Water Wonderland)

 * World 3-1
 * World 3-2
 * World 3-3
 * World 3-M (White Mouser from DDP)

World 4 (Frightmare Forest)

 * World 4-1
 * World 4-2
 * World 4-3
 * World 4-M (Super Mario All Stars Mouser)

World 5 (Stairway Sky)

 * World 5-1
 * World 5-2
 * World 5-3
 * World 5-M (Super Mario Advance Mouser)

World 6 (Icy Nightmare)

 * World 6-1
 * World 6-2
 * World 6-3
 * World 6-M (Greenk Mouser [Green Right Ear and Pink Left Ear])

World 7 (Pipemare)

 * World 7-1
 * World 7-2
 * World 7-3
 * World 7-M (Blue Ear Mouser)

World 8 (Camp Wartsucks)

 * World 8-1
 * World 8-2
 * World 8-3
 * World 8-4 (Red Ear Mouser)