Anti LITSO
Divide the grid into tetrominoes so no region matches its letter.
Controls
Draw region borders to split the whole grid into orthogonally connected four-cell tetromino regions. Every region contains exactly one letter. The letter names a tetromino (I, O, T, L or S, rotations and reflections included), and the region must not have that shape. Drag across cells to create regions, use Clear to reset and the answer button to reveal or hide the full partition.
Brain training · PuzGo