Is there cheats for Super Mario Brothers?

cannon to world 5

its easy to get to this cannon its in world 1 the level where you get the yoshis. after the fire flower plant there will be lots of koopas and goombas patroling around. use yoshis double jump to get you to a secret pipe to get you the cannon to world 5.

cannon to world 6

head to world 3 ghost house and at one point Mario has to go on a rope to aviod the boos. at one point there is a platform jump on it then off it. its not a jump to your doom. when you land you'll find a door to the warp cannon to world 6.