the PDF files from Acrobat Reader reproduces the
Challenges much better than simply printing from
within your browser.
you are printing on a color
printer, you may want to set your printer
to black & white or gray as the Challenges use
significant amounts of color. (Or just download
the black & white versions below.)
Note: It may
be necessary to scale your page setup to 85% or
select "Fit to Page" to print entire page
on a single sheet of paper.