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- 99 Lives
In world 5-3 come up to the surface and throw the shell on the ground there, it will keep bouncing off of the walls back and forth. Jump and land on the shell and wait for the birds to drop the bombs. The shell will kill the bombs, and after you get a certain amount you start getting 1-UPS, you can do this forever until you have 99.
- 99 Lives on Level 5-3 (alternate)
(This may seem like a lot of work for 99 guys, but if you are playing the game and have to complete the level anyway, why not refill your men)
While going though level 5-3...(this is when you've already accended the ladder from the start of the level, walked past all the birds dropping bombs, decended the second ladder to go back underground, walked to the left to the Tree with the door and gone through). When you decend inside the tree, then make your way up back to the top...you'll be approached by a walking fire plant. Right near (actually before he comes) there will be a pot vase that you can go inside. Once inside, you will land on a 4 shy guy ferris wheel...just on top of one of the shy guys. Pick him up, then as you ride around, just as you get to about the 9 o'clock position, throw the shy guy to the right, he should take out 2 guys at a time...even if you just get one, you get a 1 up per hit. Then as you hit the top of the "ride", jump up to exit the pot, then go right back down to be in the same position, to do it all over again.
Now what's good about this is, there's no way to loose a heart or get killed this way, plus, after you master how to throw the shy guys, you'll only have to do it a real fast bunch of times to get 99 lives. Like I said, it's not the fastest method to go and get 99 lives, but if you have to clear that level anyway, it's definently a spot to visit on that level, for a non-threatening 99 guys.
- As many lives as you wish for
When in level 1-1, when you go in the door on the ground towardsthe end, you will see a little creature and two roots. Dispose of all of them by throwing them at the 1-up bubble. Get the extra man (not necesary to get as many lives as you want). Next climb up the vine, pick up the last root (closest to the the creatures), wait for the one closest to you to land on the ground, then throw the radish at it. When it hits the last creature, you will get 1-up! Go back down the vine then climb back up and do it over and over again!
- Bald Birdo Trick
Start on any level and pick your character as Toad, complete the level, then when you face Birdo ( the dinosaur that spits eggs at you! .) As soon as she has fired an egg at you jump on her head and you can pull her bow off!. Now Birdo will be bald!
Note: This code is not a cheat it is just for fun.
- Instant Reset
To trigger the game's built-in soft reset and restart the game without using the power switch, simply hit the following buttons at the same time: Select + Start + A + B.
- Level Warps
Warp to World 4: In level 1-3 go to the area just before the brick background. Pick up the plants until you get a bottle. Then go past the brick background until you find a pot and throw the bottle on it. Go through the door and down the pot into World 4.
- Link's Awakening Cameo
The final boss Wart, is the EXACT same character from "The Legend of Zelda: Link's Awakening". This guy is the frog who gives you the "Frog's Song of the Soul". (You can find his lair after you complete the "Signpost Maze")
- Play as Bowser
First, go to the Map Screen. Press R, R, L, L, B, B, A, A, Select, Select, B. Note: Do this fast. If you did it correctly, you should hear Mario say "Mamma-mia! It's Bowser!" Then, turn off the Game Boy Advance. Turn it on, then when you go to the map screen, you will see Bowser dancing on the level you are on. Press Select to become a Bowser with a blue shell and B to go to the normal red shelled Bowser.