During the title screen, press . A sound will confirm the code. Now, is possible to select the Extra Level (more difficult than Hard Level). Selecting this option, is possible use the boss The Alien.
Zero Level and use The Alien
Immediately after the Extra Level code, press . A sound will confirm the code. Now, is possible to select the Zero Level (easier than Easy Level). You can use the boss The Alien in this difficulty level too.
Alternatively, you can unlock this by getting a high score and entering the initials KEY.
All cheats on this site should be verified as working. If you find any that are not working, please use the "Edit" link to correct the page. Screenshots can be added for verification.
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![[Down]](/dev/docs/wiki/pub/arrows/down.gif)
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