Nanro (Tapa) by JinHoo Ahn
or solve online (using our beta test of Penpa-Edit tools; use the tab key to alternate between shading and number entry modes)
Theme: Four by Four
Author/Opus: This is the 64th puzzle from our contributing puzzlemaster JinHoo Ahn.
Rules: Variation of Nanro rules with Tapa clue elements: Label some cells with numbers to form a single connected group of labeled cells; no 2×2 group of cells may be fully labeled. Each bold region must contain at least one labeled cell. Each number must equal the total count of labeled cells in that region. Numbers in a gray cell indicate the length of consecutive labeled cells in its neighbors. If there is more than one number in a gray cell, then there must be at least one white (not labeled) cell between the labeled cell groups. When two numbers are orthogonally adjacent across a region boundary, the numbers must be different.
Also see this example:
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 9:00, Master = 13:00, Expert = 26:00
Solution: PDF and solving video.
Note: Follow this link for Nanro puzzles on this website and this link for variations on Nanro puzzles. If you are new to this puzzle type, here are our easiest Nanro Puzzles to get started on. More Nanro puzzles can be found in A Number o’ Nanro by Prasanna Seshadri.
Had to see the talkthrough for this. Deducing some cells should/should not be shaded by seeing both possibilities/Extracting common logic from both possibilities around a clue were crucial here.