Google has again come up with an Easter Egg game this time. It's called Zerg Rush.
Go to Google.com, and give the search as 'Zerg Rush' and hit enter. The search results will be displayed. And soon a good number of little O's will start appearing, eating out the search results. The game is to kill the O's off by clicking on them and draining off their power. This must be done prior to them forming two large G's on the page as shown below.
Google users are allowed to share their scores on Google Plus. Earlier too they have made such games on their webpage. Like Let it Snow. Another was 'do a barell roll' which would roll the search results.