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Try to stay on the same color pipe as the Blobman's color.
Change the color of the Blobman by going through the doors.
If the Blobman and pipe are the same color, be giant, if they are different colors, get smaller.
Blobman breaks apart to form an army at the end of the run.

Become a giant Blobman for the most crowded army.
Collect weapons and shields by passing through doors of the right color.

Defeat the enemy army and win.