hacker.org

Does anyone know the best way to retrieve information on a cell phone number?

And does paying for those cell phone tracker sites for info actually works? or is it just a scam?

Wow I just checked tiwe's profile and my achievements are almost the same as him except that I solved a few more challenges.

But his rank is so much higher than mine!

I agreed with the rest of the posters, the ranking system should be fixed.

I got 37xxxxxxxxx54 but it is incorrect. Any hints on what I might have did wrong?

Hello, I have made a bot for runaway robot and finished all 513 levels. I want to know how would I make bots for other games flash games that doesn't give you parameters like the puzzles in hacker.org. For example, how would I go about making a bot for robot unicorn attack? I have no clue on how to ...

Mine solved each lvl under 2 seconds or less.

Can someone send me their algorithm? or code?
I'm not trying to cheat or anything, I beat all 513 levels. You can check my profile.

Someone mentioned a polynomial time algorithm to solve this and I really want to know what that algorithm looks like.

For the challenge "My Head Hurts", can someone give me a hint?

I don't think the title of the challenge is a hint but if it is, can you give me a hint on the hint? lol

"Looking at the set of all possible subsequences (consecutive digits)" This is kind of ambiguous to me. Can someone please explain? Consecutive digits mean numbers like 1111111111111 or 44444444444 right? So are we look for a number like 777777777777 that is a prime number? Does "sub...

Yea man I was one of those people that checked this site day by day.

I got it using java but it took like 5 minutes.

Can someone post a more efficient code using a better algorithm?

Finally got it. Would've got it sooner if I didn't get some fake hints that threw me off completely.

It is not a full meaning word.

I spent like 3 hours on this. And I got all the notes, too many possible combinations.

Someone has to tell me whether it is one word or multiple words, that is all the hint I need.

or are these challenges just for fun?

I don't want to waste my time and realize I'm still a noobie hacker once I spend a year doing all these challenges.