I agree having a good answer key is critical for this aspect.
But even otherwise having a non-guessable and non-error-prone answer key is still required for all puzzles tests, irrespective of whether it is used for 'partial bonus' system or not.

FLIP Special Booklet contains the instruction booklet and puzzle booklet from FLIP along with a bunch of extra content.
Author notes and comments.	Bonus unused puzzles.
Test facts and figures.	Brand new bonus puzzles.
Neat purple design.	Full answer key.
Thank you all once more for giving me the opportunity to host a puzzle test and for participating! Grab the special booklet now!

Click here for SPECIAL BOOKLET!

Edited by davmillar 2010-11-26 11:27 AM

David, Thanks for the Special Booklet.
I'm yet to solve any of the extra puzzles, but I love your comments and notes.
Appreciate your efforts!

Deb