My favorites:
1) Breakout Recharged - Have liked this since it was released, and I've been playing Super Breakout on the 5200 (on the real system) too
2) Asteroids Recharged - Can't beat Asteroids! Have been playing some version of this since 1980. Fantastic game 😉
3) Planet Smashers (7800) - Never played this game before since it was too expensive to track down. I am finding it fun!
Aery - Bird Adventure is a close one for 3rd place. I always love playing this game to unwind and explore. Still a favorite.
This is opt to change every so often, but as of right now, this is what I've been playing.
BB