To get at least 1 extra life per stage, do this:
1.In each stage you play, get AT LEAST 10,000 points.
2.After each stage, record your password.
3.Restart the game and enter your password in.
This way, you'll get an extra life for every 10,000 points, instead of just at the 10,000 , 20,000 , and 40,000 point-mark!
Under the password menu enter *CR3D1TS* and you will be able to listen to the ending credits theme.
*g4ll3ry*
Enter '*pnkrlz*' as a password for a Level 3 yellow spark laser on the first mission.
Stage 2: BKMBVNG7L (5 lives, Level 2 Green Laser)
Stage 3: BV0BBFGCH (6 lives, Level 1 Purple Laser)
Stage 4: D9DCBYZ7C (6 lives, Level 3 Gold Laser)
Stage 5: 0LVCVYQGD (7 lives, Level 3 Gold Laser)
Stage 6: 8M9CVYV3D (7 lives, Level 3 Gold Laser)
Stage 7: XVPDBP6FF (6 lives, Level 2 Gold Laser)
Enter these passwords at the password input screen to start the level with maximum lives.
Introduce the password *S3L3CT0N* (don't forget use the asterisks). Then introduce the password
*SH0WT1M3*. Now in the option screen you can hear the music of the game and select level and if you want, you can start on a boss battle.