The board almost full
Fit as many of the tetromino tiles (on the right) as possible into the grid, with both rotation and reflection allowed.
Then give your answer as the least possible number of empty cells in the grid unoccupied by these tiles.
The answer is 17.
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Simple Tetris: you put them in horizontal rows 3 times, each row will have 1 empty cell, or 6 total. Then in the top row, the pieces go up and down, leaving 2 empty cells per piece, (8) and there will be 3 empty cells at the end of the row. Or stick with the horizontal rows and leave the entire top 9 cells empty. Either way, 17 total.