thumb|alt=A group of four boxes with a hand-drawn diagram and text description in each box.|Concepts for Marble Madness were outlined in an extensive design document. The document contains a number of ideas, like the tilting ramp and see-saw scale above, that were not used in the final product.
thumb|alt=A group of four boxes with a hand-drawn diagram and text description in each box|Concepts for Marble Madness were outlined in an extensive design document The document contains a number of ideas like the tilting ramp and see-saw scale above that were not used in the final product