A metal injection molding apparatus is provided with features which reduce the amount of metal which enters the drive mechanism of the apparatus. A pump has a flexible tube for partitioning a pump chamber and a drive chamber, and the incompressible medium is supplied to the drive chamber by the piston reciprocating in a cylinder hole of the cylinder. A variety of play cards affect the overall game momentum of either team. The crawler can also include a communication subsystem functionally coupled between the smart control device and the serpentine robotic crawler, the communication subsystem facilitating control by the smart control device of at least one of the first drive subsystem, the second drive subsystem, and the linkage subsystem.