"Sudoku 129 Better" appears to be a short, punchy phrase—likely a title for a Sudoku puzzle variant, a particular puzzle labeled #129, or a slogan urging improvement at Sudoku. Below I present three concise interpretations with a short write-up for each so you can pick the one that fits your intent.
3D Medusa (the "9") is intimidating. You might color 15 cells, see no immediate contradiction, and erase it. That is the sign of a novice. A successful Medusa might require coloring 40 cells. The elimination is often on the far side of the grid. Patience is the secret ingredient to "129." sudoku 129 better