Hey Gorkhs,
Many thanks for your kind comment.
I checked a video of Marble Madness. Seems like Balls of Steel is a grandchild of it. To be honest, I didn't know MM before you've mentioned it. But I think I will download a kind of Emulator for the Atari, so that I can play it. I'm quite curious how the maker solved the problem of ISO-Metric View controls for the marble.
Good luck on finishing the course :D