the only downside is he now knows everything about your group, and could turn into a supervillian

• Dread-likes: Super lightweight, story- and character driven, with an unique mechanic that abstracts the whole rule book into a jenga tower.

Seriously: if you have never played a round of dread, you are missing out.

I think those categories are so broad that they disguise how many systems exist.

I don't think I'd for example call DND extremely crunchy when systems like GURPS exist. And GURPS also has derived systems like Traveller.

Then you've got the various Gamma World editions that vary from "basically just reskinned DND" to "I took a bunch of ketamine while watching math tutorials".

You've got insane systems like FATAL, where even wholly putting aside the gross content, the actual system is actually insane in how it insists on statting basically everything. EVERYTHING. So it takes like ten hours to create a character.

More playable you've got games like Inquisitor which are almost more skirmish wargamey in rules and require the players to push the RPG elements themselves. Yet at the same time the homebrew Inquisitor community has popularized "Inquisimunda" rules to make the game even more wargame like. Is that more or less crunchy? Kinda both I guess.

You've got sibling systems like Call Of Cthulhu and Pulp Cthulhu which people sometimes interchange depending on the session or they mix-n-match to make some kind of hybrid homebrew creation.

Depending on how you define family of systems while there is a finite way on how to roll the dice but at least for the main one, you miss

• Dice pools with D10 (World of Darkness), D6 (Shadèwrun, Star Wars)

• Skill (Chtulhu, Basic RPG)

• Diceless

• Playing cards (Deadland, castle falkenstein)

Then there is hundreds if not thousands of combination of these option making every game unique, so hard to make a count or a list

You'd pick up group theory and see how many are there actually

Someone made a streamer-bait frustration game where you played as Sisyphus pushing a boulder up a hill with increasingly difficult obstacles. Was very popular a few months back. Kind of like Only Up but with boulder pushing.