There's a text adventure game hiding in the source code of Google Chrome.
To get involved, open Google Chrome, and search "text adventure" (ensuring you're on google.com and not google.co.uk etc.) Hit Ctrl+Shift+I—or CMD+option+I on Mac—and "Would you like to play a game? (yes/no)" will be revealed on the console.
The game requires you to locate the other missing letters of the Google logo by way of simple text directions—just north, south, east, and west—and just two actions: "grab" and "inventory".
Given the number of people asking for help on the thread, it seems we shouldn't go in expecting an easy game, nor a quick one—some finish-times clock in at over an hour and a half.
According to u/jeremyhoffman, the locations depicted "sound like Google Mountain View buildings 45/47 on Charleston Road across from Charleston Park. Probably the one who codes the Easter egg worked in that building!"
Image credit: John Reetun