Coderloop is the coder's gym

Why do I need to register? For a website like yours I should be able to try whatever it is before I have to sign up for anything. User registration is a HUGE barrier to adoption that I don't think you can afford (or really need).<p>I like the idea, I wish TopCoder had a UI like this.

Very nice.<p>I'm not sure the ability to sort users by name is useful.<p>People may possibly be shy of showing how many times they've failed. projecteuler.net only displays the number of correct submissions for each user, and I'm personally very glad, as I can then try a variety of techniques without fear of losing "rating".<p>Of course, this may not be the way you wish to go, but I think many people would appreciate the option of hiding the number of failures.<p>In fact, if I may be pessimistic, I predict that if your website becomes popular, you will find people start opening multiple accounts in order to test solutions with one, and keep a perfect score with the other.

It's "Lua", not "LUA". (It means "Moon" in Portuguese, same etymology as "Lunar".) Also, it seems a bit odd to be using problems from Project Euler. Looks great otherwise, though.<p>I'll try to suggest more problems once I have time to dig in - how about adding infrastructure so members can submit problems themselves?

Meh, this has the same problem the acm online judge has, and the sphere judge and so on and so on. Which is also why I will stop usign this after a single attempt.<p>The issue is that it is impossible to debug these programs. I just submitted a solution. It failed. I get no input that failed, I get no message why it failed. While I can guess further inputs in this simple case (missles), for more complicated problems, this becomes simply impossible. Especially for more involved puzzles where subtle differences in problem definitions dictate the difference between a perfectly fine and a horribly wrong solution.<p>Sorry, but pretty much every coding kata site failes on this, and you did not manage to get this one (for me) crucial, make-or-break feature working.

I was pretty excited to do some of this when I got home from work, but my preferred language (Python) is only supported in an ancient version (2.3.0).<p>I wasn't sure when this version was released so I decided to look it up, 2.3.0 dates back to 2003.

How about a way to sort by puzzle difficulty (%pass out of total tries for example) so we can easily find the hard problems

I have a feeling I will get addicted to this.<p>Add more problems and you win me over.

<a href="http://www.coderloop.com/puzzles/" rel="nofollow">http://www.coderloop.com/puzzles/</a><p>When looking at this page it's not immediately obvious that I have to click on the name of the puzzle to go to it.

You should also drop people on the hello world puzzle as soon as they sign up.<p>It helps to be able to see some examples and know where/what the guidelines are before you get started

Already addicted! The online code editor with the possibility of edit a just submitted solution for a fast fixing makes the different! Great job!

Seems cool, I had to manually find my OpenID account link to be able to use it to login though.

<a href="http://www.coderloop.com/" rel="nofollow">http://www.coderloop.com/</a>

you could ask the users for the shortest correct solution in any available language this will show the relative power of each language and the flexibility of the user to seek for the best tools

support Haskell