Glue & Puncturing

Level 2: Medium

Filled cells glue a block into place; a finished block is punctured by crosses on both sides.

Highlighted cells are the new deductions: cell 3 crossed out.

Once the 2-block is complete, the cell right after it must be empty or it would make the block longer. Put a cross there.

Glue is the reverse: a filled cell that can only belong to one block pulls that block over the neighbors it must reach.