Chord Bingo is a game-like method for learning how chords are constructed and how to form them yourself on any chord instrument – guitar, banjo, ukulele, mandolin, keyboard, and others.
It's a novel way of blending theory with application: first you learn a few easy rules of how chords are made, then you put them to use. That's where the fun begins. Placing ordinary pocket coins or other small objects on keyboard or fretboard diagrams, you select the proper tones for the chord you want, arranging the coins and the tones they represent in various possible positions. It's that simple. Bingo!