EXPLICATION OF TT SCRIPT :
It s a little bit more complicated than the coop mode because you have to add a file in your vietcong folder

you have to put the tt.c in :
Vietcong\Levels\nameofmap\data\nameofmap\scripts

but this will not be enough because you they will be a compability problem with the other modes and so you have to put the new level.c that incorporate the TT mode and put it at the same place than the tt.c in :
Vietcong\Levels\nameofthemap\data\nameofthemap\scripts

then you have to put the sc_MPglobal.h in :
Vietcong\dev\compiler\inc