Simon

Simon is an open source implementation and modification of Simon, a physical electronic game of short-term memory skill first released in 1978. In the original game the device creates a series of tones and lights and requires a user to repeat the sequence. If the user succeeds, the series becomes progressively longer and more complex. Once the user fails or the time limit runs out, the game is over.

This version of the concept introduces a Soviet implementation called Electronics IE-01 Ivolga. Instead of four cells, there are now between two and ten.