On the Straightened Arrow

Normal sudoku rules apply.

Yin Yang Yong: Colour the grid red, yellow and blue, so that all cells of the same colour are orthogonally connected, and no 2x2 area is fully one colour.

A red cell's value = double its digit. A yellow cell's value = its digit. A blue cell's value = half its digit.

Straightened little killers: Clues outside the grid give the total value of the indicated row or column.

Equal value lines: A blue line joins two cells with the same value.