New Youtube Feature: Play Snake on Youtube Video's [Trick]
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To play snake on youtube you need to pause the video you are watching and hold left on your keyboard, note that this only works with videos that use the new youtube player and not the old one.
Here's a video it DEFINITELY works on: http://goo.gl/ev3b
For more detailed instructions or help: http://goo.gl/D2vS
Enjoy!