Foot Soldiers are the shock troops of the Foot Clan. In the 2014 mobile game, their design is based on the 2003 animated series but have different colors than gray, like in Teenage Mutant Ninja Turtles: Double Damage and Teenage Mutant Ninja Turtles: Arcade Attack.
In the 2014 3DS game and Teenage Mutant Ninja Turtles Legends, they more closely resemble their militaristic counterparts from the 2014 movie.