The first Google home page game - Pac-Man

Google's home page has as its logo today a Pac-Man game, to celebrate 30 years of Pac-Man. Just click on "Insert Coin" and while away a few minutes lost in one of the top arcade games of the 1980s; groovy graphics, no? Now when is an important Missile Command anniversary?

I have typed Pac-Man, but is that right? Was it Pac-Man, PacMan or Pac Man? I suppose I should google that but every time I hit that home page I have to have another play!