Requires Java 6 or higher

ATTENTION:
There have been a few comments saying it is too hard/they don't know how to win the level. If you are really stuck, read Spoilers.txt and have another go. Also there should be some info in the comments. To win a level, get 250 orbs and take them to the chaos portal (the pink thing at the end of the level, then the corrupt skill will turn gold, allowing you to use it.

Story:

You are the new Lord of Corruption. Your ultimate goal is too devastate worlds with your chaotic powers. You have come to Planet Erth* where your master meet his doom at the hands of the Paladin's Order. Your mission is to find the Chaos Portals he left behind, and to use their power, along with the strange Blue Orbs dropped by dead Paladins, to corrupt/kill all living things, and block out light forever. Fortunately, the Paladins are still guarding the portals, so finding the blue orbs will be easy. Getting to the portal alive is the hard part. So you pick up your cursed sword, put on your chaotic armour, and step through the warp portal onto
Erth.

*Not a typo. I have creative names :P
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Controls:

Arrow Keys - Move/Jump
SPACE - Attack. Make sure you hold it down. DON'T press it rapidly and then complain it doesn't work. This is a feature, not a bug.
WASD - Special skills that consume Orbs.
Down Arrow - Special skill that has a cooldown.
P - Pause
F12 - Screenshot
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How to win:

You goal is to corrupt the entire world. To do this, you must collect 250 orbs from the Paladin's Order who were sent to stop you, find the chaos portal, and use the corruption power (the S key). Once this is done, you will move to the next level. At the end of the last level, the screen fades to black forever. Don't complain that it stopped working. If you want, copy the levels from /res/levels/bonus into the /res/levels directory, and then it will move on to the bonus levels when you finish.

If you get stuck at any point, look at "Spoilers.txt" and see if that helps. ONLY IF YOU'RE STUCK.

If you want to make your own levels, see "How to Make Your Own Levels.txt" and have fun messing around.

If you want to mod it, or find out how something works, download the source and start hacking away at it (Hopefully you have the JDK and some Java IDE).