Press and release the button on this game and watch as the three 7 segment displays each randomly light up with 1 of 4 possible letters. Get all three the same and four LEDs flash while you celebrate. 4 AA batteries not included.

Principles taught: large scale digital logic, flip-flops.

Components: 36 resistors, 11 capacitors, 3 diodes, 4 LEDs, three 7 segment displays, 13 ICs, push switch, slide switch, battery carrier.