All the secrets are marked except for the one on the first screen behind the bone barrel (press down). Also, if you are worried, you can cheat by using invincibility and going through the President Aslik in Feeco Depot part again. The 10 Mudokons at the end will reappear to be rescued or killed at your whim each time you do it (kill them by getting them in a fight , slapping them etc. instead of using the bird portal). To open the door again, just watch the TV sequence again past the electric doors.
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