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Click on Bricks
A ThinkQuest Junior contest winner
See it on The Wayback Machine.
In 1998, I entered the very first-ever ThinkQuest Junior contest as a fifth-grader, on a team with a student from another district.
Our entry, Click On Bricks, taught the basics of multiplication through visualizations of LEGO-style bricks generated from the software Gryphon Bricks.
It was good enough for a fifth-place win in the Mathematics category. I used the cash prize to open up my very first bank account.