When the players design the droids for their mission they have to take into consideration the physical aspects of the mission. If a droid is supposed to go up a steep incline where traction is a problem, the player needs to assemble parts to accomplish that goal. The droid parts available include heads, bodies, arms, hands, legs or wheels, and batteries. Each type of part is modified to be well adapted for specific needs. Some heads have good night vision, others have acute hearing.
Players can choose to mix and match different kinds of arms and hands.
The weight of each part is given so that the player can design a droid that is within specific weight limits. Completed droids can be viewed in all directions while they are walking or dancing to music and adjustments can be made before they are sent on their mission. The droids directions and speed can be controlled with arrow buttons. Judgement about energy expenditure is required when playing because the faster the droids go the more energy it takes. Players can also investigate scientific principles involving machines, light, energy, forces, and materials.