In reply to RBonney:
I do quite a lot of bouldering, and would agree that I'm not a fan of rules/eliminates. But I acknowledge that it is, or can be, part of the game, unlike in the vast majority of trad climbing.
I've not bouldered on limestone and I think it's the lack of 'lines' that doesn't appeal (as well as the fact that it looks hard....). Grit bouldering most frequently has 'lines' but you sometimes create the problem by sit start off particular holds, not using the arete, match the rail.....etc. The best problems usually have a clear line and few ways to 'cheat' it, and don't need to consult forums/locals etc to make sure you've done it right.
That said, it's a game so you can have great experiences by creating rules around what is and isn't in.