MIPS
MIPS is a Yellow Rabbit found in the Castle Basement when the player has collected fifteen Power Star. MIPS will actively attempt to flee when Mario approaches him. If Mario catches MIPS, he will give Mario a star. MIPS appears in the basement a second time after Mario has collected fifty Stars. Mario can catch MIPS again and will get another Star from him. After getting the last Star, MIPS will not reappear for the rest of the game. MIPS was used extensively in early Nintendo 64 test simulations[citation needed]. Mario was originally going to be able to throw MIPS, but this was removed[1].
MIPS Clip
In speedrunning, the trick called MIPS Clip is used to bypass the 30 Star Door that leads to Dire, Dire Docks and Bowser in the Fire Sea.