How do some people cheat?

[DerekJS]

How is it possible for someone to have a blue shell, or a bomb, and set it off on you in the starting line, before the race even starts?

 

[MMK35000VR]

Hacking. Homebrew Channel, Riivolution, or ISO Files.

 

[FTL WAZ UP]

hacking w/ homebrew or anyother way hacking mario kart