List of Mario & Luigi: Partners in Time glitches

This is a list of glitches pertaining to the game Mario & Luigi: Partners in Time.

In Thwomp Caverns, use the Baby Spin in the cyclone. If Baby Mario lands on the ? Block on the left platform, Baby Luigi stays there, and Baby Mario warps to the platform above. The player can't enter piggyback mode now or change to the adults. This glitch can be fixed by moving Baby Mario into the spikes, which will take both the babies to the platform above.

In the Vim factory, go to the room with the red and blue stairs and switches and go to the top-right corner and hop up the steps and go on the left wall path and walk close to the end and stop, half of baby Mario and baby Luigi's body will be in the ground. (This glitch only works if none of the switches have been hit.)

In the Koopa Cruiser, walk at the left edge. When the Koopa calls the babies, Baby Luigi walks to him, but Baby Mario stays, making a motion like he walks.

While the L33t Hamm3r Broz. are teaching Baby Mario and Baby Luigi how to counterattack with the hammer, if Baby Mario lets go of the X button before L33t Hamm3r Broz tell them to, the game will glitch but not freeze. During this glitch, the music will keep playing, the Spiny Shroopas and the babies will keep doing their battle poses, but the X symbol will remain on the screen and the Hammer Bros. will not continue their explanation.

When training on how to jump with Mario and Baby Mario or Luigi and Baby Luigi and everyone gets high POW, if one of them jumps on them, the adult character and the baby character might jump back, and they will stand and look at the ghost forever. The only way to stop that is by turning off the system or restarting all over again.

If the game is paused while on-screen enemies are performing certain motions (usually spinning), they will be unable to move when the game is unpaused. Everything else will work normally.

If the player does not unlock the pipe leading from Peach's Castle to Princess Peach's Castle Dungeon, after the player has returned from the Star Shrine, the player will end up trapped in the Castle Dungeon and from there, the player will never be able to get back to Peach's Castle unless they last saved anywhere before the cutscene leading to the battle against the Adult and Baby Bowsers.

Anytime after opening the Time Hole to Toadwood Forest, the player must throw the babies into the Time Hole first and let the adult Bros. The player follows automatically, as usual, but, if the player looks at the top left corner of the screen, before the big Bros. fly out after the babies, they can see Luigi facing away from the screen standing on the purple liquid just barely on-screen.

At the top of Princess Shroob's statue is a control room that detaches for a minigame where the player battles the Shroob Mothership. After the minigame, the control room returns to its place to let the player off. At the Save Album nearby, save and quit, and the control room won't be on the map when reloading the game. It will reappear on the map after defeating Princess Shroob or if using the Warpulator. This glitch is harmless because the player can still enter the control room even if it's missing from the map.

In the caves under Gritzy Desert, in the room where the Big Bros. must roll in ball form and hit an ! Block to move on, the player should go to the area where the ! Block was. Go right and hit or  to make Luigi or Baby Luigi jump on the area where the ! Block was and make Mario or Baby Mario move over a little. Then stop moving. Luigi or Baby Luigi will be walking up and down the hill on the platform while Mario or Baby Mario randomly warps around in a small area. Sometimes, Mario will get stuck in the hill. If he jumps, he'll stand in midair. Other times, Luigi or Baby Luigi will make it off the platform and just stand there, leaving a big space between Luigi or Baby Luigi and Mario or Baby Mario. If this happens while piggybacked, hitting or  to throw the babies off will make Baby Mario land the normal way while Baby Luigi will fly through the air really fast and land right behind Baby Mario. If they head back to Mario, Baby Mario will climb on right away while Baby Luigi will travel to Luigi really fast without moving and climb on. If Mario goes left, Luigi will walk right and they will be face to face, and if Mario doesn't pass Luigi, he won't move behind Mario like he's supposed to. Then, if the babies are thrown off, they will go past each other and land back to back, with Baby Mario facing Luigi and Baby Luigi facing Mario.

This glitch only works when the player is controlling the adult Mario brothers. At the beginning of the fields near Hollijolli Village, the player should head over to the trees in the top left corner and walk behind them. Continue moving up and down as well as forward after heading back as far as possible. If done correctly, the player should head back farther, as well as seeing Mario standing on top of the trees. If the player moves away, the glitch ends; vertical movement does not affect it.

Throwing the babies into the two Save Albums where Stuffwell lets the Bros. use his Warpulator will cause the action icons to go crazy for a short time before disappearing. Normally, the icons smoothly move upwards and off-screen when hitting these Save Albums.

Note: This glitch is only present in the U.S. version.