Get an Arduino, 6 pushbuttons, and 25 LEDs. Connect the pushbuttons to ground and to each of the analog pins.
Connect all the anodes together in each row and the cathodes together in each column like in the below schematic.
The anode rows should connect to digital pins 0-4 and the cathode columns should connect to digital pins 5-9. Based on the diagram in the previous steps, connect AN0 - AN4 to pins 0-4 and CA0- CA4 pins 5-9.
Upload the Arduino code from the Github page. Go to:
and copy and paste the code into the Arduino editor.
Run the Arduino program and have fun!