Google I/O 2013 Easter Eggs
Most people don’t know about this but if you head on over to the Google I/O, their 2013 event website shows big I/O images that you can click and it reads out the letters ‘I’ and ‘O’. Enter the right code and you get nice effects. Here’s a list of codes you can try out.
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Cat Mode: IIIOOIII
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Space Mode: OOIOIOIO (doesn’t work on Android)
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Pong Mode: IOOOOOOI
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Bacon Mode: IOOIOOOO
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Simone Mode: IIOIOOII
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Eightbit Mode: OIOIOOII
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Synth Mode: IOOOIOOO
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Song Mode: IIOIIOII
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ASCII Mode: OIIIIIII
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Bowling Mode: OIIIOIOI
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Rocket Mode: OIOOOIOI
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Burger Mode: OOIIIOOI
So head on over to the Google I/O 2013 website and try these out :) Note that Synth Mode will work only if you have audio enabled and Space Mode will not work on Android devices.
Source: http://zakelfassi.com/2013/03/08/all-googleio-easter-eggs/