Dragon is a game that has a colour changing dragon. The device plays a sequence and the user has to follow it precisely, and get thedragon's manecolours to change in the same sequence as depicted by the phone memory. To do this, the keys 1 to 4 are used on the devices keypad.
If you get the sequence wrong, the Dragon will tell you. You will then have to start building a new sequence from scratch, and forget entirely the pattern of the previous one. However, if the sequence is correct, the Dragon will compliment you, and another step will be added to the sequence of colour changes.