CustomGame.Unpause();
Syntax
public void Unpause()

Unpauses the server and starts a 5 second countdown.

using System;
using CustomGameOW;

...

static void Main(string[] args)
{
    // 5 second countdown for race.

    CustomGame cg = new CustomGame();

    cg.Pause(); // Pause game.
    cg.Unpause(); // Unpause and start 5 second countdown.
    cg.Chat("Get ready to race!");
}

See also:

CustomGame.Pause()

CustomGame.TogglePause()