A game very much like this one: http://www.hack-test.com
Where you're supposed to look the the code of the website and such, to advance to the next step.
The game I'm looking for is just like this I guess, but it had picture of a cartoon pond (with a frog in it?) or some other ype of cartoon drawing. Not just raw text like the one I linked. This is probably from around 2009-2011.