Every region of the grid holds one piece of four shaded squares joined side to side — a tetromino. Square 2×2 pieces are not allowed, so each piece is an L, an I, a T or an S (rotations and mirror images count as the same shape).
All the shaded squares together must form one connected group, no 2×2 block may be completely shaded anywhere, and two pieces of the same shape may not touch along a side across a region border.
Start with small regions — a four-square region is its own piece — and look for squares every possible piece must use.
Shade one piece of four connected squares (an L, I, T or S) in every region so that everything joins up, with no 2×2 blocks and no matching shapes touching.
The full guide, with a worked example and common mistakes: How to play Tetro Shade.
Yes — an L and a backwards L count as the same, and so do the two S shapes.
Yes — only matching shapes may not share a side across a border.
Yes — every puzzle here is checked to have exactly one solution.
Open the Tetro Shade Solver, draw the regions and press Solve.