Note: achievements' progress doesn't carry over across attempts. Also I unlocked most of the achievements, don't look at them if you don't want it spoiled. Try beating my high score!!

I believe they are allowed. But I didn't implement them, since I didn't have implemented ability to store and use values. Wouldn't be too difficult to implement something like checkX(<comp>,<value>), and something similar for the rotation. Would that be useful?

It's because of applet security. Which case (like here on gallery), it creates a local clipboard within the applet since it cannot access the system clipboard. You can try pasting into the JOptionPane (pressing F6) for inputing code (But may not work either). Printing the code out was just a safeguard for you the user to have your code.

I've noticed UserInfo sometimes seems to disconnect after long durations of the scenario being paused. (In that it will fail to connect again), and in some instances I have had it fail to store after the first time (Don't believe I had it happen yet on here). Otherwise I don't know why there would be a problem saving the code and scores. I will consider implementing a return statement.

@Builderboy Found and fixed your error. (Didn't have any check for you incrementing memory variable - didn't realize the Creature class throws that Exception for that method, thought it handled it silently) But found something else causing a NullPointerException that I'm looking into.