Puzzle Using Variables and References

Hi all,

I am new to this forum, I started using Storyline couple of months ago and I found it is a powerful tool in creating E-learning courses. I have created a Puzzle using variables and references. Please post your feedback and suggestions. You can view the puzzle here and you can attempt to slove it:

http://googledrive.com/host/0B_FNxdC_BSwCYTRVeFpzWHR3NU0