In the Thwomp Volcano, there is a part where you are supposed to get 30 gems in order to pass. When you complete it, go out then go in again. Step on the Thwomp and say "Yes" that you want to play. Get any number of gems, and if you do not get 50 gems you will get 20 coins. Repeat this to get as many coins as desired. Note: The game is free.
During a battle, press Attack for Mario or Luigi to dodge enemy attacks.
Once you learn Baby Mario and Luigi's ability to dig underground, each time you see a small circle with an "X" in it, throw Baby Mario and Baby Luigi by pressing X or Y. Then, press R, B(2) to go underground. Move underneath the circle with the "X" in it, then press B under it and you will receive a bean.
Wait for the Shroobs to get a Poison Mushroom and the Boss will turn green. Then, start attacking him, but do not hit him if he is red. Additionally, wait until one of the Shroob doctors gets a Poison Mushroom. Then, attack the one that has it. Use a Cannon Bros. item. It does 52 damage, and you can defeat the Boss very quickly. Attack him when green, but not when he is red.
Note: Having lots of Ice Flowers is recommended. When Baby Bowser uses his adult form as some sort of hockey item, use your hammer to smash it back to him, because he will continue to heal his adult form. If you succeed, Baby Bowser will miss hitting the adult form and he will be on his own for a small amount of time. Also, get Red Peppers to increase your attack and Blue Peppers to increase your speed. Give the Red Peppers to the adult Mario and Luigi and keep using Ice Flowers. An alternative is the Green Shell or the Pocket Chomp. If used correctly, there should be a signal that his defense has lowered. Continue using Ice Flowers (or if you are out, a Pocket Chomp or Cannon). When he goes back to his adult form, continue damaging him, then use the hammers again and continue the process. After Baby Bowser is defeated, just repeat the same process with adult Bowser.
When the battle begins, you will be facing three Shroobs holding a large Shroob-like Bomb-omb. Attack and destroy the middle and rear Shroobs so that the front Shroob is crushed by the bomb because he cannot hold up the weight himself. The bomb will roll backwards, blowing up Commander Shroob, allowing you to attack him. The best attacks against him are the Ice Flower (to lower his stats, and do critical damage), Copy Flower, and Red Shell, given you have good timing. His attack is mostly slapping Shroobs towards you; defend with your hammers. He has a lot of HP, and the battle will last awhile because after a few turns he will summon more Shroobs with the bomb again. Repeat the first strategy to reveal Commander Shroob again, then repeat the second strategy until he is defeated. High Pow and a lot of patience is needed.
Mrs. Thwomp can be a bit difficult, but if you see the pattern, it should be easy. She will usually jump up on the top of the screen and spin. If she lands on the Mario's side, make Mario jump first, then Luigi, and vice versa. If she manages to jump in the middle, make them both jump at the same time to avoid damage. She will also spit out rocks at you. Try to break them, because you will be given items such as Ice Flowers, Fire Flowers, Coins, and Mushrooms. When you damage her enough times, she will break apart and have four mini versions of her. Pay attention to which eyebrow raises, as that is the direction they will be going. When they jump toward you, just hit them with the hammer. If they hit you enough times, you will get dizzy and may miss a couple turns. When it is your turn, get a Red Pepper and use Ice Flowers to hit them all. It might lower some defenses. Continue using Ice Flowers. It will then transform back to its bigger self and continue the same process. It may seem like the battle is endless, but continue the process and she will eventually be defeated.
Jump on The Piranha Plant and use Red Peppers. When it is grounded to the floor, try to avoid the quicksand by doing multiple jumps. Once it is stuck inside the ground, it will try turning off the lights to get a Boo to steal an item from you. Smack the Boo with a hammer to prevent this from happening. Use a Fire Flower or Ice Flower and keep hitting it. Using an item such as a Pocket Chomp will only hurt you. Repeat the process until it is defeated.
Use Copy Flower or Trampoline on the shield, then once it is broken, use Mix Flower or a Red Shell since they are very powerful. She will then attack you with orbs; you must time your jump correctly. She will then either pull out another shield and attack with lasers and see if the lasers are pointing up or down. If she does not pull out another shield, keep hammering her with attacks. Eventually she will get in her chair and make another shield. She will then attack by going up and getting four robotic legs. She will jump above one of your characters and shoot laser rings at one brother. Immediately jump when the ring reaches the brother's head (or lower if you desired). She will get straight and try to sit on you. Counterattack with your hammer. Sometimes, she will stop her move directly above the brother, then continue her attack. Heal if needed and attack. Keep doing this and you will defeat Princess Shroob and find out why princess peach did not want you to collect the Cobalt Star Pieces.
Have the Ulti-Free badge (bought in Fawful's shop for 90 Beans) on Luigi and the Shroom Badge A on Mario. Also have lots of Super, Ultra, Max Mushrooms; Drops; and 1-Up Supers. Start out by hitting her as hard as possible with repeated Mix/Copy Flowers every turn with Luigi. Just have Mario attack normally. Once you take off half her HP (3000 HP), she will appear to die, but instead turn into a much more powerful form with four tentacles and a cluster of tentacles at her feet. When this happens, target her foot or all of her with a Mix Flower. When the foot is destroyed, she will get shorter. This allows you to target her crown. Destroy or knock off her crown so that your attacks will work on her. Repeat this process until she is defeated and watch what comes next; be prepared, as she has 6,000 HP.
There are five eggs in front of Sunnycide. Ignore Sunnycide and go for the eggs. Attack an egg until it hatches, then a Yoshi will come out and start pushing a boulder on a ledge high above. Hatch five eggs while avoiding Sunnycide's attacks, and the Yoshis will launch the boulder at Sunnycide and knock him down. He is now vulnerable. Attack him with anything you have while avoiding his attacks until he stands back up. Repeat this process until he has been defeated.
In Peach's Castle (Present), go into the item shop. Walk up to the counter, and behind the Toad that sells items is a poster of Prince Peasley from Mario And Luigi: Superstar Saga.
When you first arrive in Holli Jolli Village, go into the Mayor's house. Hit him out of the chimney and he will look like Santa Clause and say "Ho Ho!".
- RED: Mario
- GREEN: Luigi
- red: Baby Mario
- green: Baby Luigi
- GREEN: Luigi
- RED Jump: A
- GREEN Jump: B
- red Jump: X
- green Jump: Y
- RED Jump (extra damage): A (just before enemy)
- GREEN Jump (extra damage): B (just before enemy)
- red Jump (extra damage): X (just before enemy)
- green Jump (extra damage): Y (Just before enemy)
- Mario Piggyback Jump: X (just before enemy), A (just before enemy)
- Luigi Piggyback Jump: Y (just before enemy), B (just before enemy)
- RED Green Shell Attack: A (to start attack), B, A, B, A, B, etc.
- GREEN Green Shell Attack: B (to start attack), A, B, A, B, etc.
- red Green Shell Attack: X (to start attack), Y, X, Y, X, Y, X, etc.
- green Green Shell Attack: Y (to start attack), X, Y, X, Y, X, etc.
- RED + red Green Shell Attack: A (to start attack), X, B, A, X, B, etc.
- GREEN + green Green Shell Attack: B (to start attack), Y, A, B, Y, A, etc.
- red Hammer: X
- red Hammer (extra damage): X (when hammer shakes)
- green Hammer: Y
- green Hammer (extra damage): Y (when hammer shakes)
- RED Piggyback Hammer: A (when hammer shakes), X (when hammer shakes)
- GREEN Piggyback Hammer: B (when hammer shakes), Y (when hammer shakes)
- RED Cannon Bros.: A (to start attack), ?, ?, ?, ? (where ? is A, B, X, or Y)
- GREEN Cannon Bros.: B (to start attack), ?, ?, ?, ? (where ? is A, B, X, or Y)
- GREEN Jump: B