Google is failing me. Maybe you guys know the answer.
I like tetrominoes (apparently the proper term, not "tetrads" as mentioned in some earlier Tetris games), and I fairly recently bought
two "Iceblox" ice cube trays that make tetromino ice cubes (well, not cubes, but you know what I mean) from
thinkgeek.com. Each tray makes two of each tetromino, except only one of each of the the Z- and S- (or reverse-Z-) shapes for some reason. It got me thinking about them again.
Anyway, it's impossible to fit all seven tetrominoes once each into a 7 x 4 grid. But I haven't yet figured out (or found on the Internet) if it's possible to fit them all twice in a 7 x 8 grid. And furthermore, if they can be placed in such a way as to be rotationally symmetrical. (Or horizontally/vertically.) Anyone know?
