Original archive (radsw20.zip, 3,908k) - The main download link above works in DOSBox after unzipping; the file radsw20.zip is the original archive.
Radix is a spaceship 3D shooting game which is somewhat similar to Descent. It still owes a lot to Doom though, and the level design is not quite up to par with Descent. Still, it has nice graphics (for its time) and good sound effects as well. The control system also takes some getting used to, as you need to control your ship's speed but the ship can also "strafe" from side to side.
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Games may take awhile to load. CTRL-F12 attempts to speed up game, CTRL-F11 attempts to slow it down.