Silencer

Silencer is an online, multiplayer-only video game by Mind Control Software that was published by the World Opponent Network (WON.net) for free play on their website in January 2000. It features capture-the-flag-style gameplay—common in 3D first-person shooter arenas at the time—but presents it in a low-resource 2D package. The game was released by WON.net as an open beta. It saw a number of beta updates before it was removed, without explanation, from WON.net's website in September 2000 and the multiplayer servers shut down in October 2000. Silencer is a bit of an anomaly in that it managed to spawn a fan-made WONswap site, 7 known fansites, plus a legacy of independent multiplayer servers and game clones, from its short run as an open beta on WON.net.