[GreedCtrl]

Speaking of great-looking puzzles, this youtube channel covered a visually stunning pi day sudoku some time ago. As you said, it uses extra constraints to reduce connectivity, but still, I find it amazing that the digits of pi can fit so well into a puzzle. (Pi begins at the top and moves clockwise.)

    +-----v-----+
    |   |431|   |
    |  8|   |4  |
    | 3 |   | 1 |
    |---+---+---|
    |2  |   |  5|
    |3  | 6 |  9|
    |9  |   |  2|
    |---+---+---|
    | 7 |   | 6 |
    |  9|   |5  |
    |   |853|   |
    +-----------+

https://www.youtube.com/watch?v=N41yZsxIsK8

[jansan]

+1 for the great formatting.