Can you make this fiendish Sudoku your friend?
23"Why Can't We Be Friends?" by Ryokousha & Philip Newman
Try the puzzle here: https://f-puzzles.com/?id=yyq2b286
Here's a helpful image of all friendly cell possibilities: https://imgur.com/a/H5P1xPZ
Rules (watch the start of the video if you're confused):
Normal sudoku rules apply.
A “friendly” cell has a value identical to its row-, column- or box-number, counted in the standard way. A cell which is not friendly is "unfriendly".
The green "lawn" cells are friendly. (For example, r1c7 must be either 1 to match the row, 3 to match the box, or 7 to match the column.)
Additionally, an orthogonally connected one-cell wide path must be found between the cells marked with circles, such that every cell on the path - including the marked cells - is friendly but not lawn.
Along the marked arrows, the digits in the friendly cells (any friendly cells - whether lawn, path, or otherwise) sum to the same total as the digits in the unfriendly cells.
Check out Simon's solve of Ryokousha's first friendly puzzle here: https://www.youtube.com/watch?v=5SGSLjLKO_w
0:00 Intro
3:09 Rules
7:21 Solve path
45:53 Outro