Altered Beast

Extended Life: During the title screen, hold the D-pad up-left and press either button to get a life meter of five segments.
Continue: When the words "Game Over" appear on the screen, hold the D-pad up-left and press buttons 1 and 2 simultaneously. (This allows one continue.)
Continue 2: After you use up your first continue, you can get four more. When "Game Over appears on the screen, rotate the D-button (in either direction) and press buttons 1 and 2 simultaneously.
Bosses: Aggar: Stay at the left edge of the screen. Shoot fireballs towards Aggar until one of his heads is directly above you. As it falls, use the flame arrow to move out of the way (while destroying any heads in your path). Turn around and use the flame arrow again to move back to the left edge of the screen. Turn around and continue shooting fireballs at Aggar. Repeat until you defeat him.; Octeyes: Stay at the left edge of the screen. Shoot lightning at Octeyes when his eyes are open. Be sure to shoot down any eyeball spores that get too close. If needs be, use the Inner Strength attack to defend yourself.; Crocodile Wyrm: