These three are extremely simple and fun:
Ghost Blitz
The Mind
Skull
Everything boardgames
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These three are extremely simple and fun:
Ghost Blitz
The Mind
Skull
Yes! I think these also fall in the "can be explained within 1 minute" category
6 Nimmt has gotten an extensive amount of play in my group and I think I can explain it from scratch in 45 seconds.
I'm not sure it falls into your category but skyjo. It is a tiny bit complex and while a game is short one usually does play a series of games tracking points. But single games are totally fine too imo so maybe it qualifies.
What I have come to love about the game as a dad of two is that the game can be paused and picked up with zero downside. The game has no hidden information one can know and no information to keep track of. No past plays to remember or anything. If you know the game I could sit you down at a table mid game, tell you nothing but whose turn it is. And you could continue playing as if you were there from the beginning. It's great if you are interrupted by the kids, cats, dogs, door bell, mom calling, house on fire, ordered pizza. That makes it such a nice game got parents imo.
Skyo is great, quick to learn, the older part of my family also grasped it quickly and had fun.
Saboteur is really fun card game. Is simple , has team building gameplay and also betreyal plus a point system.
When I played we where 12 , so a lot of people can play as well.
The simplest I can think of is Strike. You are throwing dice into a pit and hope for the best. You do have some control in trying to hit other dice to change their value and you have push-your-luck decisions to make. We sometimes use it to decide the first player in the real game.
Zombie Dice and Martian Dice are some other simple dice games I like. And since OP mentioned Spot It I will throw in Spots which is a newer game, I don't have a physical copy yet but had a lot of fun with it on BGA.
Outside of dice games I like Bandido a lot. If you look at the components you can probably figure out what to do without reading the rules. Works solo or co-op. Another one: Illusion, you are simply comparing which card has more of a given color.
Our group got REALLY into Love Letter. It was supposed to be a filler game but sometimes we played for hours, especially after a thinkier game.
Eventually we got a bit burned out but then they released Lovecraft Letter and boy did we get right back into it. It felt like a refreshing expansion of sorts.
Didn't have much success with the more casual folks, tho, not everyone likes to "accuse".
@pathief @legendarydromedary I introduced my in-laws and nephews to Love Letter a few years ago and they love it. I have a raft of more casual games like that and Hanabi, No Thanks, and Cash N Guns 2e for their visits!
Werewords is twenty questions mixed with werewolf. If you played werewolf, you understand the rules immediately. The app takes care of dealing with the hidden information. So it's really simple. And every time somebody says "we'll play a couple of rounds before going home" I know I'm staying for a couple of hours, because two rounds turns into twenty really easily.