...also Pacman btw (the original arcade machine), and other 80's arcade machines like Pengo or Bomb Jack (notably Bomb Jack was two Z80 computers duct-taped together, the sound was handled by a separate Z80 board which controlled three AY-3-8910 sound chips).
Punch-Out!!
But most noteworthy is Galaga: Ran on 3, count 'em, 3, Z80's.