What is this S/A/B/C/etc. ranking? Is anyone else using it?

relaxing 3 hours ago | parent | next [-]

Apparently S being a level above A comes from Japanese grading. I’ve been confused by that, too.

	▲	swiftcoder 3 hours ago \| parent [-]
		It's very common in Japanese-developed video games as well

vikramkr 3 hours ago | parent | prev [-]

Just a tier list I think