F is like the "triumphant, stunning, you have to see this piece of shit" grade. D and D- are the "after watching this movie you feel dead inside because it exists" grades.

Daw thanks.

Old games being harder mostly owes to two factors.
Firstly, the arcades. Arcade games are designed for short experiences that end quickly, so one person doesn't hog the machine, but also keep the person wanting to play, so they'll put more coins in the machine. The standard method for this was to make the game…