This category is for the web game Stellar Crisis, originally developed by Sylvan Clebsch in 1995. It was the first widely known multi-player strategy game on the Web. Stellar Crisis, often referred to as SC, can be played with any graphical web browser, under any operating system, even at slow connection speeds. No browser plug-ins or extensions are required, not even Java or JavaScript. SC is a game of two-dimensional territory conquest, with similarities to some classic board games such as Risk and war games. Players build ships to explore and colonize an empty universe. When they meet other empires, they may have the option of peacefully trading, or even allying, or they may be forced to go to war, depending on the parameters of the specific game. Each server hosts many concurrent games, each with a limited number of players in it. The source code for Stellar Crisis is freely available, under a license that lets anyone see it, modify it, or host a server, as long as the game is always free to all players and presented without advertisements.