Do you remember Simon? Simon was a hand-held electronic game, introduced in the mid 1970's. In it, you were challenged to reproduce an ever-growing sequence of flashing lights and musical tones, using four colored buttons. Its great success and simplicity spawned a huge number of imitators, and was largely responsible for the hand-held electronic game craze which continues to this day. Otra (from the spanish "otra vez", or "one more time") is a computerized memory game in the spirit of Simon.