The inside surface of the box is made up of many squares with large numbers on them. The squares also have smaller numbers printed in the corner.

The user places numbered blocks on the inside of the box to add up to the number designated on the surface of each square while keeping the box from tipping over. The spring has a constant to a degree such that it can withstand up to a certain amount of unbalanced force before the box leans too far and the blocks fall out. The blocks vary in weight according to the number printed on them.

For Ages 3+

The user learns the principles of addition as well as balance and weight.

Learning games such as this can be fun and engaging for a child, while the balancing goal adds an element of excitement.

The item is made from a combination of wood and a metal spring. The base is heavy enough to support the above structure from tipping the base.

All pieces are large enough to avoid choking hazars and no pieces are excessively heavy.

The toy should be quite durable. The first thing to malfunction would most likely be the spring due in large part to abuse.

The approximate construction cost for 1 toy would be around $20 decreasing with production down to possibly as little as $1.