D&D 5e stats, how 'bout instead of the usual 4d6 drop, you just roll 24d6 all at once, drop the lowest six, and arrange the remaining eighteen as desired?
I'd really love to understand the statistics of this, but it's just too goddamn complicated for me to do by myself. Nevermind the sheer number of possibilities, you have to account for all the possible choices of each possibility.
I've rolled a bunch of them and it kind of feels like a cross between 4d6 drop and point buy. You feel like you're in control, but you get the same basic range of stats. It's not too hard to get an 18, pretty easy to get a 17 or 16, and kind of impossible to get anything lower than an 8.
Math majors, don't be afraid to show off.