All that's needed is a Unity player plug-in, and to create an account with a user name and a password.
Julian Gollop, Chaos Reborn's developer, created UFO: Enemy Unknown in 1994; it was was called X-COM: UFO Defense in North America. Chaos Reborn is an expansion Gollop is basing on his 1985 game Chaos: The Battle of Wizards.
He is trying to raise $180,000 by Thursday to complete the project; his Kickstarter has raised about $150,000 as of publication.
Chaos Reborn's web prototype is "rough and ready," whose graphics, user interface and animation all are placeholders, Gollop writes on the title screen. "So judge it by the fun, not the bling." The game will offer procedurally generated 3D battle arenas, pitting magic users against one another. Some of the spells they use will be drawn from the original Chaos.