I am so close to a complete US collection, just missing Atlantis. I see that Brazilian Atlantis a lot but the US one seems hard to find.
I have the other 48 titles and all Magnavox/N.A.P./Year variants that I am aware of. For example:
Out of this World!/Helicopter Rescue! with Magnavox 1979, NAP 1979 and NAP 1982
Speedway!/Spin-Out!/Crypto-Logic! with Magnavox 1978, NAP 1978 and NAP 1982
K.C Munchkin! with white or yellow text.
And of course a boxed O2, Voice and a few homebrews.