Icarus Six Sixty Six

Yes. Icarus Six Sixty Six is free to play on Steam, so there is nothing to buy to start playing.

The minimum requirements for Icarus Six Sixty Six are: Windows 7, GeForce GTX 970, Intel Core i5-4590, 4 GB RAM, 500 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.

No. Icarus Six Sixty Six is a single-player game.

Yes. Icarus Six Sixty Six is the full base game. You need nothing else to play it.