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I expect you may be playing the game with the Audio turned off, you will need to turn it on, as at the point where the game repeats itself, you have two or three options to which platform you wish to run across.
If you run across the correct platform you will hear a ring, if you run across the incorrect platform you will hear a buzzer :(.
Just make sure you run across the correct platform, and you should arrive at the last boss fight. :)
Good times!
try jumping on his back again (10 times)it might work