Here are two of three Roller Bomb designs. The bomb travels in a straight line and navigates any plane or obstruction in its path and only explodes upon contact with organic material ( there is a quick sketch illustrating this). The third illustration will be posted shortly and will consist of a launching mechanism to send the bomb on its way.

The first is a hand powered version that would function in the same manner as your toy hot wheels car. Press the tred of the tire against the ground plane pulling towards your body which sets an internal charge, and then release the bomb and it takes off!

The second is a self powered bomb that you aim in the direction you want the bomb to travel and let it go!