Birthday Mickey is a fan made easter egg on Abandoned: Discovery Island.
He appears to be a normal Mickey Mouse toon, except he his birthday hat on and carries a birthday present around.
He only appears on a special night called " Birthday night" If it's somebody's birthday. To unlock the night, the player must enter there birth date in the extras and when it's your birthday, you can activate that night in the extra. In this night, the whole building will be decorated with streamers and balloons. Nobody is active except for Birthday Mickey. He will start at Character Prep 1, when in the office, the player must shut off the camera or he will kill you. If you complete the night, a cutscene will show him giving you a birthday present and telling you " Happy Birthday" and the night ends.
Birthday Mickey starts at Character Prep 1, then he goes to Staff Area, Meat Freezer, Bathroom, Lounge, and then the office.
He was created on Originator156's birthday.
He and birthday night are both easter eggs.