Test Mode#
To access the game's Test Mode, at the title screen, press Up, Right, Down, Left, Up, Right, Down, Left, I. If done correctly you'll be sent to this screen, which has a sound test, a level select, and a controller test. You can also modify the amount of lives you start with. The "Inertia" option changes the speed and inertia of your helicopter as it flies around the stage.
(Source: SMS Power)