I didn't see one that really addressed "just" this... on whether or not a game was compatible or not, so I apologize if one already exists, but figured we could start one and help Atari add to their list.
Note, I have 200+ Atari 2600 games, a lot of weird and rare ones, so I plan to bust those out in January and hook up an old 2600 next to a CRT and test them side by side with my 2600+.
Just tested a few games, and these didn't work.
FAILSAFE - Atari 78