Q*Bert plays like the NES version. Centipede maybe like the Atari version? Both are pretty fun, I haven't got to play them much because the kids have hijacked them and taken them to play.
Pac-Man is pretty basic, black & white, low frame rate, plays like an old electronic game, joystick is kinda hard to get in the direction you want (Q*bert and Centipede have physical 4 way restrictors, Pac-Man does not).
Same black / white electronic game feel to space invaders, however, easier to control, the graphics and gameplay are better than the Pac-Man one.