At the Main Menu after finishing Arcade mode simply press the L button and on the Dragon Radar the words Dragon Click will appear.
Next, press the R button to begin the mini game. The object of the game is press the R button as many times as you can before time runs out.
Complete Dragon Road and go to the main menu. Press L and Dragon Player will come up on your Dragon Radar.
Dragon Player is basically a Sound Test where you can play all the music from the game.
Start in transformed state
When selecting a transformed character hold the R button. You will start in a transformed state and not have to power up and transform during the game.