BlockSquad1000's Jacob's Mind is a Mind series following the thoughts of Jacob, an Aperture Science Test Subject who tested the Paint Gun. The series started on February 21, 2015. It is entirely created by BlockSquad1000, and the game used for the series is Aperture Tag: The Paint Gun Testing Initiative. The main protagonist of the game is unnamed, so BlockSquad1000 created a name for him; Jacob. Jacob (voiced by BlockSquad1000) is an amnesiac character, who can't remember any details about himself. The series is him completing his test, and at the same time, trying to remember details about himself. It can be viewed at BlockSquad1000's YouTube channel.