Zanac Ex

After losing your last life and before the game over song plays, hold Select and you'll hear a different tune.

While playing, hold the Select key and press Stop. You'll see some numbers appear in the score area. Use the directional keys to increase or decrease the numbers which in turn will modify the colors in the entire game.

While playing, you'll see some statues with big red eyes. Shoot them to refill your weapons to the max. If you have weapon #0, you'll get 4 free lives.

While playing, press the Stop Key to pause the game. Now, hold the Select key and press the directional pad to adjust the screen centering.

Play the game and get a game over. When the game over tune plays (or right before it ends), hold S + C + D + T until the sound test appears. Use the directional keys to select and play the songs.