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If I remember correctly your program needs to exit successfully. There may also be a limit violation e.g. steps or height/width causing the challenge not to be accepted.

That's a quite general hint Smile

Most of the time at hacker.org you convert one number into another representation e.g. into hex or binary and then interpret things differently. I don't know of a forma ...

Hm... I had no idea so far how to approach this challenge? Any hints? Shocked

Is there any trick or do we just have to find out what programming language is used?

Google for "monitor color profile" to find an answer for this issue!

Welcome to Hacker.org Smile

I'd suspect that your program doesn't do the login "right". In this case you play the game anonymously and losing all progress in the end. You should check your cookie handling... and of cou ...

Yep. The information is still at the same place and is accepted as solution when entered.

The challenge is OS independent, although the tools to solve it are not always available by default.

Okay, now that we know that is really web-related, how about some real hints? Really.
I mean, a collection of dates could be nearly everything...

What makes you think that there is only 1 valid way of setting up a web server?? I hope you learned that there is no such 1 way! One goal of all these challenges is to learn! Especially with hacker.or ...

This is why it's called "challenge" Smile

Maybe it's time to read the challenge text again? And maybe again... Can you show me the line where it says what content type to use? Rolling Eyes

All depends on your internet connection. I ran a web server on my local PC and (temporarily) forwarded the port through my DSL router. Dyndns will be a big help with this setup...
This way you have a ...

In many challenges a source of pain: Did you check your output for "hidden" characters like "carriage return" or "line feed"?

My nearly none optimized perl script takes 231s for level 513... 100s took the "pre-optimization": probably the worst code I ever wrote Smile

But I never changed it because it was "fast e ...