This is an absolutely fantastic game for learning recursion concepts! I'm going to give this to my nothin'-but-C++ programmer friend and see if it stretches his brain.

Many of the harder puzzles are both beautiful and challenging.

For the silverlight-impaired, Light-Bot is a similar game and works in Flash

http://armorgames.com/play/2205/light-bot

edit: Ah, I didn't notice there was a javascript version too. Oh well.

looks like a ripoff of Light-bot game http://armorgames.com/play/2205/light-bot

funny that they copy a game and make it more boring then the original, in light bot you get to program robots in 2.5D and not arrows.

light-bot is better :edit: too late

Checked them both out, light-bot doesn't seem to have conditionals. Don't want to have recursion if its going to be infinite :D

Eh, this is better :) (Reason: conditionals + repainting the stage).

try level flooder! It's not hard but veeery cool to watch :)

I got it right on the first try as sort of a guess and you're very right, I was not expecting that and it was neat!