Yes, Google put it there them self, they are not hacked.
It is for celebrate the PacMan’s 30th anniversary.
Anyway, some of you might not aware that it is not just a 1 person game.
When you click the “Insert Coins” twice, you can see that there is 1 more player added into the game.
It is a 2 player game.
The 1st player is using the arrow keys to control while the 2nd player’s key is “WASD” keys to control.
Enjoy the game at Google!
You can also play mine ones here which it is a Flash version of PacMan.
PacMan 30th Anniversary by Garfield, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.