After plugging in my brand-new (or actually nor-so-brand-new) Atari SC1224 Monitor, there was just one and only one adequate game for re-inaugurating my Atari 1040ST: Speedball (by the Bitmap Brothers).
A highschool-friend of mine and me used to play this for endless hours, and - after years of practicing - we achieved something like mastery.
Today, more than 15 years later (OK, admitted, I also played it once or twice on PaCifiST, another Atari ST emulator on the PC - but hey, this wasn't quite the same), I reached knockout round 8 out of 10 in my first Speedball tournament. Gee, I need to train harder! And I want my old Arcade Joystick back!