To get to World 4, you have to go to World 2 and do the final boss of the world as Mini Mario. Then you can proceed to World 4.
There are two ways to get to World 7. One way is by entering the ghost house in World 4 as Mini Mario and take the secret exit. This will access the cannon to World 7.
Another way is by doing the final boss in World 5 as Mini Mario. Then you can proceed to World 7.
By going into a cannon
if you mean ds,beat world 2's boss as super mini mario.
Technically, Super Mario World is already Super Mario Bros. 4. In fact, its working title before being released was "Super Mario World: Super Mario Bros. 4."
It depends because in New super Mario bros. it's a lush forest
You have to beat Mummipokey (the boss of World 2) as mini Mario.
this is if you mean new super Mario bros you get a mini mushroom and do the boss with the mini mushroom in world 2 and 5
You have to be mini Mario and complete it the same way as you complete world 2 to get to world 4
You have to be Mini-Mario (tiny blue mushroom) as you fight the boss in world 2 (for world 4) and world 5 (for world 7)
All you have to do is go to the world 2 castle and beat the boss with mini Mario
On the last level of world 2 use tiny Mario to fight the monster and you can get to world 4 with tiny Mario
10. Paper Mario 9. Super Mario Sunshine 8. New Super Mario Bros. Wii 7. Mario Galaxy 2 6. Super Mario RPG 5. Super Mario World 4. Mario Galaxy 3. Super Mario Bros. 3 2. Super Mario 64 1. Original Super Mario Bros.
Beat 7-4