“Shopping List A breadboard (Jameco #2212218, Bitsbox #CN204) with at least 60 rows. Breadboard jumper wires (Jameco #2237044, Bitsbox #CN236)—you’ll need around 35 for this project. Standard hookup wire works, too. A standard 9 V battery to power the circuit. A 9 V battery clip (Jameco #11280, Bitsbox #BAT033) to connect the battery. A 555 timer IC (Jameco #904085, Bitsbox #QU001) to create the timing. A 10 kΩ resistor (Jameco #691104, Bitsbox #CR2510K) to set the game speed. A 100 kΩ resistor (Jameco #691340, Bitsbox #CR25100K) to set the game speed. A 1 µF capacitor (Jameco #768183, Bitsbox #CC006) to set the game speed. A 4017 decade counter IC (Jameco #12749, Bitsbox #QU020) to control the LEDs. Two standard blue LEDs (Jameco #2193889, Bitsbox #OP033) Two standard red LEDs (Jameco #333973, Bitsbox #OP002) A standard green LED (Jameco #34761, Bitsbox #OP003) Ten 100 Ω resistors (Jameco #690620, Bitsbox #CR25100R) for limiting the current to the LEDs. A 4011 NAND-gate IC (Jameco #12634, Bitsbox #QU018) to create the SR latch for starting and stopping the game. Two 1 kΩ resistors (Jameco #690865, Bitsbox #CR251K) to act as pull-up resistors for the start/stop circuit. Two push buttons (Jameco #119011, Bitsbox #SW087), one for resetting the game and one for playing.”