The gameplay of Avoid The Roid is very similar to asteroids.  In single player mode, the player moves his ship around, trying to shoot all the asteroids without running into any asteroids.  The asteroids show up as light gray dots on the radar when they are in front of you and dark gray dots when they are behind you.  The enemy ships show up as light red dots when they are in front of you and dark red dots when they are behind you.

The default keys are as follows:
w - thrust forward
s - thrust backward
u - rotate counter-clockwise
o - rotate clockwise
i - pitch downward
k - pitch upward
j - turn left
l - turn right
r - fire shot
q - turn on shield
t - show score (Deathmatch only)
x - quit game

The keys and other game options can be configured through the game menus.
The number of asteroids, amount of powerups, and other gameplay options can be configured in the ATRServerConfig or ATRServerSingleConfig file.

To start the game in windows, run the atr3d.exe executable.  To start the game in linux, run the atr3d executable.

Avoid The Roid also has several multiplayer modes.  To play a multiplayer game, first modify Server Configuration file to configure the game, then configure the game for each client and change the Server IP and Server Port variables to the IP address and port of the server that the game server is running on.  Then start the server and on each client select the start multiplayer game option.  To start the game in dedicated server mode type atr3d -ds.
