This is an en example of a completed Entropic Line Sudoku. For Entropic Line Sudoku, we can define,

1. Low value: 1-3
2. Medium value: 4-6
3. High value: 7-9

On an Entropic Line, any 3 consecutive cells must contain a Low, Medium and High value.

For the line on the left of the puzzle, we can see the values are 6 (Medium), 7 (High), 2 (Low), 6 (Medium), 9 (High), 2 (Low), 4 (Medium), 7 (High), 3 (Low) etc.
We can pick any 3 consecutive values here, and we will have one Low value, one Medium value and one High value.