I grew up with an Intellivision, so here are some of my favourites from then that I have each played for many hours:
Astrosmash might be the “best” Intellivision game? It is a pretty good shoot-the-stuff-falling-down-the-screen game

Advanced Dungeons & Dragons: The Treasure Of Tarmin is an early attempt at an rpg / dungeon crawler. It has nothing to do with AD&D, really. It certainly doesn’t use AD&D systems – 2nd Edition was long out and well established by then, and there isn’t a THAC0 in sight.

Space Battle is a pretty straight forward shooty game with a very minor overworld/tactical map.

Space Armarda is just Space Invaders. It is worth a cursory look just to see. We didn’t have a 2600, so this is the version of Space Invaders I played and am familiar with.

Star Strike is basically a game about the trench run from Star Wars. Instead of needing to shoot missiles in to a tunnel at the end of the run, you need to bomb a certain number of targets along the way. I sometimes had fun deliberately losing in order to watch the planet blow up!

Thunder Castle is an action game where you need to find the special macguffin in each map that is basically a power pill that then lets you kill the baddies. It might have been the first time I saw a game with a title screen that wasn’t the Intellivision’s default green background with white text, and that alone was impressive at the time
Diner is weird. I always knew it as “the sequel to Burgertime” but I don’t think that is genuinely true – I think it is, at best, a “spiritual sequel, kinda”. In this game you need to kick food balls (the manual calls them things like lettuce, cabbage…) down to the bottom of the screen to fill a plate.

Chip Shot: Super Pro Golf was the first golf game I ever played, and got me hooked. I enjoyed computer golf games for ages – although I haven’t seen/played any of them in the last at least 20-25 years now. I wonder if anyone other than EA are making them.

And then we had 3 of the Intellivoice games, and they were like magic. Hearing clear voices come out of a game was so thoroughly impressive – I still have many of the lines of speech from these games burned in my memory to this day.
B-17 Bomber is a WWII bombing run game where you fly from england, over the channel, and bomb targets within Europe. Along the way you get attacked by fighters and have to man the gun turrets to shoot them down, then you open the bomb-bay doors and have to line up your targets.
“Fighters! Twelve O’Clock!”
Space Spartans is a bit like Space Battle but with a slightly more complicated tactical map.
“Starbase two under attack”
Bomb Squad might have been my favourite Intellivision game, but that may also be down to the fact that there was something wrong with our cart and most of the time it would not load/run properly – so the times I could get it to work were all the more special. It is a combination of action and code-breaking that I found rather compelling.
“They’ll never do it in time…”
