High Quality Content by WIKIPEDIA articles! Quake II ThreeWave Capture the Flag also known as Zoid`s CTF, or Q2CTF, or simply (Vanilla) CTF within the Quake II community, is an objective-based teamplay mod for Quake II inspired by the traditional Capture the Flag game. It was released on 19th Feb 1998. This mod ultimately influenced many other Capture the Flag mods for games to come.