you dont need to unlock them you get them for free
agent5
Rescue squad mater, mater the greater, el materdor, undentified flying mater, Tokyo mater, monster truck mater, heavy metal mater, moon mater, and mater private eye
Some of the episodes from the "Mater's Tall Tales" series include "Rescue Squad Mater", "El Materdor", "Tokyo Mater", "Unidentified Flying Mater", and "Monster Truck Mater". These episodes feature Mater as he tells exaggerated stories about his past adventures.
SPYMATER
You have to finish the game, and have 100% at the beginning to open them.
The first is Simba, the second is mater and the third is dinosaur
It Already Is Unlocked You Just Need To Plug Another Controller In
Hater, later, traitor, sedater, mater, crater
go to bonus character in main menu enter characters and buy cars
1.Super fast start cheat code--IMSPEED 2.Unlock all races cheat code--MATTL66 3.Unlock all paint jobs cheat code--R4MONE 4.Unlock Mater's Speedy Circuit and Mater's Countdown Cleanup cheat code--TRGTEXC 5.Unlimited boost cheat code--VROOOOM 6.Unlock all movie clips cheat code--WATCHIT 7.Unlock all cars cheat code--YAYCARS That's all I know of. I'll type more when I find more!
first what is a mater it is really meter and 5 METER ARE GRAETER