TAS?

Tool-assisted speedrun http://en.wikipedia.org/wiki/Tool-assisted_speedrun

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Any way to decrypt levels?

There is. Open it with something like Tokens or Ti Graph Link. A few characters in on the first line, you will see the password.

I don't think TI-Graph Link opens such program. It normally only opens BASIC ones. SourceCoder and TokenIDE should, however.

Played the level in school, CRUEL appears easier than LEGEND or NEEDLER, partly because I can actually pass the first three levels

@Binder News: Have you tried any of the levels in my post?