Tetrominoes Puzzles 
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The Tetrominoes (shown at right) are polyominoes made of four squares. They are most familiar as the elements of the game Tetris.
Tim Bohdan of IBM in Houston, Texas suggested this problem to me,
which he got from the instructions to
Blokus:
To try your hand at solving this problem, use my Blokus Puzzler Applet.
For a larger set of problems based on TetraTetrominoes (4 sets), see Kadon Enterprises special Twentieth Anniversary page.
For another set of solutions, using different constraints, see Page 2
With Tim's help, encouragement, and fast computers,
I wrote a program to find these solutions to the 8x10 and
9x9 (minus one) boards.
Note some of the wonderful properties:

