How to Unlock World 4 in Super Mario Bros. DS

Step-by-Step Guide

1. 1

   Step 1: Go to world 1

   Remember the ? block where the Mini Mushroom came from, since you'll return to this spot later on. ,, Make sure that it's in the bubble in the bottom right corner; this means that you've saved this power-up for future use.
   
   Defeat the level again.
   
   You may now become big but don't replace the mini in the right corner ,, Turn Mini, and defeat the worm. , It should reveal world
   4.
2. 2

   Step 2: level 4.;

3. 3

   Step 3: Find the Mini Mushroom and become Mini Mario.

4. 4

   Step 4: Beat the level

5. 5

   Step 5: while in the form of Mini Mario.

6. 6

   Step 6: Play the level again

7. 7

   Step 7: and get the Mini Mushroom power-up.

8. 8

   Step 8: Go to the final castle in World 2

9. 9

   Step 9: and clear the level to get to the Giant Worm boss stage.

10. 10

    Step 10: Touch the Mini Mushroom power-up that you've saved earlier.

11. 11

    Step 11: A cut scene will play

12. 12

    Step 12: were Mini Mario will fall into the mini hole

13. 13

    Step 13: and walk past the sign.

Detailed Guide

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