Blobby and the Blobbylings

BLOBBY

Blobby is the proud father of his blobbyling. The only problem is that all blobbylings look the same, so he tends to lose him easily in the crowd...

GOAL

By applying simple maths, you need to end up with one blobbyling after going through all the doors. Pay attention to the information provided by the environment, you wouldn't  want to lose you own blobbyling permanently...