Easy Star points
When you get into the Glitz Pit, fight until you are near rank 7 or 8. You should now be fighting 'the fuzz'. Kill the black Fuzzie that has 3 HP then kill the Flower Fuzzy (pinky). Next, keep the green one near 1 HP remaining. He will split in two. Kill one of them (always leave one alive). It also helps when you have Koops out for a partner. Just leave Mario in front and Koops in back and use his Shell Shield (new attack when you upgrade him). Every time that it breaks, put a new one on. It helps to have some Happy Heart or Happy Flower badges equipped. Keep doing this and you can get 50 Star points in about five minutes.

Luigi clothes
To get Luigi's clothes, go to where you get the sixth crystal star. From here, do a spring jump up to a pole on the left side. Do another spring jump to reach a ledge with the Luigi Emblem.

Wario clothes
To get Wario's clothes for Mario, go to the central area of Rougeport with 360 Coins. There should be a merchant with a large mustache. He sells something called a Wario Emblem from time to time. It is a badge that requires no badge points to wear.

Waluigi clothes
Equip both the Luigi Emblem and the Wario Emblem at the same time. Your clothes will be exactly like Waluigi's.

Ms. Mowz
In story mode, you will get six characters (Goombella, Koops, Madame Flurrie, Yoshi, Vivian, and Admiral Bobbery). However after Chapter 4, go to the Trouble Center and take the chore of the mystery person. You will figure out that it is the mouse thief and when the mission is over you get the partner Ms. Mowz.

Defeating Hooktail
Before fighting Hooktail, get the Sound Changing Badge in the jail cell. The sound is a cricket noise, and is Hooktail's weakness.

Defeating the Shadow Queen
Make sure that you have 60 HP, 60 FP, and 30 BP. When you fight her just as Peach use Vivian as your partner. Then. use the spinning jump and Vivian's Shade Fist until the Shadow Qween turns into her other form. Then switch to Koops. Use his power shell to attack the hands and the body. Then, use the Power Smash badge. Also, when she adds 7 more to her next attack, use either Koops' Shell Shield or Vivians Veil. Make sure both Koops' and Vivian's level is at the highest. Repeat this and you should be able to win. Do not forget to heal and make sure you have a lot of Life Shrooms
Rewards available in the Pit of 100 Trials
For every 10 levels you complete in the Pit of 100 Trials, you'll earn a new badge or other item:
Bump Attack Badge - Complete levels 71-80
Double Dip Badge - Complete levels 51-60
Double Dip P Badge - Complete levels 61-70
Fire Drive Badge - Complete levels 11-20
Lucky Day Badge - Complete levels 81-90
Pity Flower Badge - Complete levels 31-40
Return Postage Badge - Complete levels 91-100
Strange Sack (doubles inventory space) - Complete levels 41-50
Sleepy Stomp Badge - Complete levels 1-10
Zap Tap Badge - Complete levels 21-30

Super Mario World music
When you get an important e-mail (ie; the e-mails from Princess Peach), wait a couple of seconds and you will hear music from Super Mario World.

Easy Money
Once you've gotten to PetalBurg in the First Chapter you can use a trick to make easy money. First go to RougePort and buy as many sleepy sheep as you can carry, making sure to fill up your storage box aswell. When your pockets and storage box is full, head over to PetalBurg. Once at Petalburg, go into the Item Shop to sell your sleepy sheep for a 2 coin profit per sheep. Make sure you remember to withdraw and sell all the sleepy sheep you stored. To increase productivity, on the way back to rougueport, stock up on turtley leaves, again filling up the storage box, and sell them at the item shop where you picked up the sleepy sheep to gain 2 coins per leaf. After getting Taste T. you can cook the leaves into koopa tea for an extra 1 coin per leaf.

Turn into NES Mario
Just like in the first Paper Mario, there is an easter egg to revert Mario from paper to 8-bit sprite. Only this time it works on your partners too! In the X-Naut Base in Chapter Seven. Find the room with the swinging grate on Sublevel 2. Stand under it and use your Ultra Jump to jump up into the air vent. Press R and slide through the grate on the far right. You'll land in the changing room where Peach disguised herself, inside one of the stalls. When you pull back the curtain, you and your partner will be a sprite. This change does not affect game play and will wear off when you leave the room