I've been trying to beat my current High Score and thought that I'd look at the manual for this game. Turns out that there are 16 Game Variations, with 4 possible Difficulty Switch combos. b/b, b/A, A/b, and A/A. I've always assumed that Game 1 is the default here, as there are no other Game Variations in the system.
Does not allow you to direct your shots
Enemy ships do not move in a random fashion.
The player cannot move their ship horizontially
Collisions do not destroy your space ship (all this time I just thought that this game has lousy collision detection).
Manual Scan From Atari Mania:
Full disclosure: I own this game on cart, and I even have the manual (I'd just never paid much attention to it).
So, should I submit requests for the other 15 Game Variations? With the four possible Difficulty Switch combos that means submitting 62 requests.