Greendog © 1993 Sega Enterprises, Limited.
* Continues: Enter Down, Right, Up, Left while paused for 9 continues.
* Extra Lives: Enter Left, Up, Right, Down while paused for 9 lives.
* Refill Health: Enter Down, Up, Left, Left while paused to refill your health.
* Stage Skip: Enter Left, Up, Up, Down while paused to skip the current stage.
Game's ROM.