It’s an affordable way to build your own version of the popular Simon Says electronic game from the late seventies. To add your own flavour, you can, for instance, tweak the tones, or the speed. The breadboard assemblage is mine. Visuals done with fritzing and for processing I’ve used an Arduino Uno microcontroller (they’re both FOSS). As for the code, I’ve taken it from here. I only had to make two minor changes to the code: change two variables from type: to type: for the sketch to work properly. The winMerge screenshot below shows the diff on lines 15-16.

To play this memory game you have to remember and reproduce the sequence of the flashing lights and sounds. The game evolves incrementing the difficulty on a +1 basis (levels can be tweaked, for instance by implementing control via a potentiometer). You can visualize the progress from what the program prints to the console on serial port COM3 (beware that showing off this information via a LCD display may distract the players!). See it in action on the movie below.

Sketche's code: