Thankfully, Google tossed out the logo with pretty low “perceived affordance” – they put an “insert coin” button next to the search button, but I imagine most users missed that. In fact, I’d wager that 75% of the people who saw the logo had no idea that you could actually play it. Which the world should be thankful for.
Google's celebration of Pac-Man's 30th anniversary was fun, enabling people to play Pac-Man on their main search page, either as a one- or two-player game. And people certainly took advantage of the opportunity, spending approximately 4,819,352 hours on the game alone. The result is approximately $120 million in productivity lost, in one day.