Super Mario Bros. 2 is a fantastic game. It doesn't get as much respect as say the first and third games. The main reason is because it's technically not a Mario game, instead it's a copy of a game called Doki Doki Panic. Nintendo just replaced the sprites for Mario characters and that's how the US got SMB2. Some of the sprites weren't even changed and some became cannon in the Mario mythos. 
Japan got the actual SMB2, which we got later on called "The Lost Levels". It didn't come out in the US because they thought it would be too hard for Americans.
			
			Japan got the actual SMB2, which we got later on called "The Lost Levels". It didn't come out in the US because they thought it would be too hard for Americans.
 
				
		 
			 
 
		 
 
		 
 
		