Discovering this machine in my early twenties wasted so much great time.
Star Raiders - I first saw it in Erols playing on a 'big screen' (25" or so). I had to have one - up til then I had been saving for an Apple - now it all went to a 400 with tape machine, BASIC, one joy stick and Star Raiders.
Star Raiders - 3D first person stick controllable space warfare, a full set auxiliary systems that impacted gameplay - with great strategy to boot.
I hooked more friends on that game and sold a few Ataris.
I always thought the explosion 'slowdown' was to savor the moment grin - it was taxing the hardware.
In addition to excellent renditions of most fun arcade games the platform also came out with:
M.U.L.E. - Still never equaled beer & screw your neighbor game - If only the Wii had this.
Silent Service - Greatest sub sim for eight bits - sinking a carrier and surviving was incredible.
Eastern Front - Great Avalon Hill style wargame - again done in very small 8K.
Ballblazer - Very smooth 2 player hockey type action - limited strategy but again amzing on 8 bit 6502
and of course all the normal Zork and Space invaders type games.
Yep would be driving a Tesla instead of a Civic if it wasn't for that computer....