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: