Puzzlerium Tour: Chained Block

   

Rules: Shade some cells in the grid to form blocks of any shape.

1. Each block must contain exactly one number or a question mark.

2. A number indicates the size of the block that contains it.

3. Diagonally adjacent blocks form a chain. A chain cannot contain two identically shaped blocks, counting rotations and reflections as the same.

4. All blocks must be diagonally adjacent to at least one other block.