How do i make a character run forward in a map?

[SonikkuBoy]

All's in the title, all i want to do is push the character right forward until the end of the level (or special stage if you wanna know what i'm doing) in the style of CD's special stages, or the secret rings gameplay.

 

[Mizzhap]

The only way I can think of is to make a lua script that makes all character's speed be above 0 FRACUNIT.