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[bigbossSNK]

Kudos on the Rock Paper Shotgun mention.
Still, fix level 10.

[BlandFord]

I know this is more of a feedback thread, but I'm absolutely stuck on level 9 for quite a while.
Anyone willing to help me before I curl up and cry again?

[tjubert]

Thanks guys, chuffed at allt he new traffic, though my inbox has exploded overnight!

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Usually if people get stuck on #9 it's because they skip a step in the final drop down box. It's a very simple and obvious statement which I guess seems too trivial to include for many people.

Essentially, the contents of the final drop down should eb the same as the final line of the whole argument.
 

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[Pencerkoff]

Hello this is Pencerkoff

Still, fix level 10.

I think the choice of symbols makes that part confusing.  Don't use the greek alphabet, there aren't greeks around anymore for a reason.

-PENCERKOFF

[bigbossSNK]

Nah, the symbols are clear.
Just that level 10's answer is il/logical.

[Ben Kuhn]

What do you mean by "illogical"? If you mean that it is an invalid progression from givens to a conclusion using the axioms of propositional logic (http://en.wikipedia.org/wiki/Propositional_logic), I beg to differ. It's actually provably correct.

Of course, if you mean that it becomes completely nonsensical by stripping away any context from the underlying formal system, then I completely agree with you. In fact, I think that's the point.

[bigbossSNK]

I said illogical, because it is illogical.
For it to be logical, one of the statements would have to be changed to IF AND ONLY IF.
(I'll let you figure out which when you try to prove it)

[Hideous]

I got stuck on puzzle 9. I'm pretty sure I was right, it just didn't seem to like the order. Stupid puzzle.

[tjubert]

A lot of people seem to get stuck on that one, though I think more often than not it's because the correct answer seems a bit odd.

It's also possible that I've missed dedecting a potentially correct statement combination. If you feel like you've got a correct answer that's not recognised please do post it here and I'll check things over.

Puzzles 6 and 10 are now corrected with IFF formulations :-)

[tjubert]

I've just been made aware of a possible fix for the drop-down positioning bug. If anyone who's experienced this problem is able to test it out for me I'd really appreciate it.

Simply download and install this microsoft package: http://www.microsoft.com/downloads/details.aspx?familyid=048DC840-14E1-467D-8DCA-19D2A8FD7485&displaylang=en

This may update your system fonts, and correct the problem. Please do post your results back here!