This was originally a Google Doodle (the best Doodle, in my opinion), celebrating the 30th anniversary of Pacman. Type "Google Pacman" into the search box, and a playable version of Google Pacman will pop up. Play with your arrow keys.
Typically, seeing the "There is no Internet connection" notification in your browser is a bummer. But if you use Google Chrome, you can unlock a simple-but-addictive runner mini game by pressing your keyboard space bar while on the page.
Type "zerg rush" into Google's search box, and your search results will be attacked by red and yellow Os acting like zerglings in the real-time strategy game StarCraft. If you do nothing, the Os will quickly eat up all the search results and eventually spell out GG (Good game) on your screen. But you're not without defense -- click on the Os to shoot them with your mouse before they eat up all your results. A score box on the right side of the screen records your APM (actions per minute) and how many zergling Os you successfully destroy.
To load the Google Earth flight simulator, type Ctrl-Alt A or Cmd-Opt A on a Mac. You'll have your choice of planes. Flying is another matter altogether, but the place to get started if you lack a joystick is the Google Earth keyboard controls help page.
Type "Google in 1998" into the Google search box, and the Google page will transform into, well...what Google looked like in 1998, when it first launched, complete with 1998's search results courtesy of the Wayback Machine. (Click "Take me back to the present" to get real search results about Google in 1998.)
The Google homepage has an I'm Feeling Lucky button, which takes you directly to the top result for your search query. But if you don't have a search query, you can roll over I'm Feeling Lucky to get different feelings -- I'm Feeling Artistic, I'm Feeling Puzzled, and I'm Feeling Trendy are just some of the options. Click the button to go to a Google-curated page for each feeling, e.g., I'm Feeling Hungry takes you to the search results for restaurants, while I'm Feeling Wonderful takes you to the Google Cultural Institute and displays a world wonder.
A Google search for "Conway's Game of Life" yields a life simulation. For those of you who have no idea what I'm talking about, Conway's Game of Life is a zero-player game that uses a set of rules to evolve from its initial state. Google's Game of Life evolves to spell Google (if you watch it for a while).
This isn't a Google Easter egg, and maybe isn't even an Easter egg at all. Instead it's with the sarcasm-laden Let Me Google That For You site, which people can use when others ask them silly questions easily answered with a search engine. This particular cached LMGTFY page, though, sets things off in an unending loop of reloading.
Google Maps' pegman character, used to signify the perspective of the street view feature, changes on special occasions. And when he shows up at Legoland in Carlsbad, Calif., he turns into a Lego character.
(The new version of Google Maps no longer shows pegman as a Lego character.)