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Games:
LetterGrid - A rich version of the game Boggle®.
Reverse LetterGrid - A reverse Boggle® game. Can you arrange a grid of letters to form a set of words?
Triangulate - A challenge of geographic distances.
Colorado Birds - A birds card game.
Colorado Mammals - A mammals card game.

Quizzes:
These quizzes were generated by analyzing data from the Census Bureau and other sources on the web. You can use them in two modes: Deduction mode, where facts about a mystery answer are provided one by one, until you guess the right answer, or the more traditional multiple choice, where you try to match a given fact with one of five possible answers.

U.S. States Quiz - This quiz presents facts about the 50 states.

You can click on the tabs to customize a quiz. You can change the frequency with which a given category of facts is chosen, and you can also change the frequency that different answers appear. For example:

State Capital Quiz - This quiz uses the same data set as the States quiz above, but with only the state capital category enabled.

County Quizzes - Here are some quizzes at the state county level:

California County Quiz58 counties
Colorado County Quiz64 counties
Iowa County Quiz99 counties
Kansas County Quiz105 counties
Minnesota County Quiz87 counties
Montana County Quiz56 counties
Nebraska County Quiz93 counties
Ohio County Quiz88 counties
Pennsylvania County Quiz67 counties
Texas County Quiz254 counties (yikes)
Wyoming County Quiz23 counties
Other projects:
Spirograph
Turtle Geometry