binary solitaire (my fav)

http://ourworld.cs.com/manyclarks/binary_sol.html

Here is an interesting way for students to get familiar with binary
numbers. I wrote this program as a learning experience, with the
thought of using it at the science museum where I worked. Didn't have
occasion to include in any exhibits yet. It is played like the familiar
seven-stack solitaire game, but has binary numbers on the cards from
0000 to 1010, (1 to 10 decimal). I've made this downloadable.