Terra X by JinHoo Ahn
or solve online (using our beta test of Penpa-Edit tools)
Theme: 0 to 7
Author/Opus: This is the 53rd puzzle from our contributing puzzlemaster JinHoo Ahn.
Rules: Place a number from 0 to 9 into each area so that no two areas that touch orthogonally share the same number. Wherever four areas meet at a point (marked with dots as a visual aid), the numbers in those areas must add up to 10.
Also, see this example:
Difficulty: 2 stars
Time Standards (highlight to view): Grandmaster = 1:45, Master = 3:00, Expert = 6:00
Solution: PDF and solving video.
Note: Follow this link for other less common Number Placement puzzles.