What I like about Numskull is the way they handle the joystick and button layout.
You will find that Numskull keeps the screen crisp and the sound clear during gameplay.
You will notice Numskull pays attention to the little details on the artwork and panels.
You will find that Quarter Arcades runs on batteries, so you can put one anywhere.
I like that Quarter Arcades uses original artwork from the retro games you remember.