Author/Opus: This is the 9th puzzle from guest contributor Bryce Herdt.
Rules: [Variation of LITS]. Shade exactly four connected cells in each outlined region, to form an L, O, T, or S tetromino, so that the following conditions are true:
(1) All shaded cells are connected with each other;
(2) No 1×4 group of cells can be entirely shaded black;
(3) When two tetrominoes in adjacent regions share an edge, they must not be of the same type (L, O, T, or S), regardless of rotations or reflections.
Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.
Time Standards (highlight to view): Grandmaster = 3:30, Master = 5:15, Expert = 10:30