[Rizard]

pawn Код:

stock CreateCheckpointHere(playerid, Float:size) //Not sure what this'd be used for though
{
    new Float:x_, Float:y_, Float:z_;
    GetPlayerPos(playerid, x_, y_, z_);
    SetPlayerCheckpoint(playerid, x_, y_, x_, size);
    return 1;
}

tried to use this function earlier but noticed a typing err in here: @SetPlayerCheckpoint ... the z value is x_

Good job, all the way.

[EDIT] include updated, problem solved.