I have one of these. It's a game you have to have 2 people to play. you can adjust the gravitational force, add a bounce back barrier, in expert selection you have drift like Asteroids but in beginner there's no drift. the 2 rotating objects are space stations. One for each player where you can repair and rearm your ship but, if you enter the wrong one it destroys you. Player one is like the enterprise and player two is a Klingon war bird. all the settings are a matter of the buttons you select on the control panel. I paid $200 for mine working. the game is on a countdown timer, You can destroy each others ships until the timer runs out, each time your ship is destoyed you get a new one. It's a Black and White non Vector monitor. It's a cool 2 player game. It's not really any harder than Asteroids and it's a very small cab. Similar in size to Q*bert.