Simon Says Assembly Guide
|Polarized Component||Pay special attention to the component’s markings indicating how to place it on the PCB. Polarized components can only be connected to a circuit in one direction.|
Locate the four LEDs.
The LEDs are polarized. This means there are “-” and “+” legs. Each LED has a short leg and a long leg. The short leg goes into the hole labeled "-". Locate their positions on the PCB.
Insert the four LEDs into the top of the board. Also, make sure each of them sits flush with the PCB. Then solder them into place.
For more information about polarization with LEDs, please check out this tutorial on Diode and LED Polarity.