Build incredible mazelike marble rollercoasters with both the starter and advanced construction kits. They retail for between $20 and $30.

The React-o-Meter is a multi-level interactive electronic game meant to sharpen wits as well as the power of concentration. As the multi-colored lights flash on in the hand held unit, the player must press each button below the light. The sequences vary in both pattern and speed, making it both challenging and addictive.