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Hurray!  It's another Christmas Tree Sudoku! Givens take the shape of silly decorations.  There is nothing else to say about these. ...

Numbers placed in marked adjacent cells must be of opposite parity (i.e. one is odd, the other is even).  Please note that not all such cell...

Unfortunately I seem to be saving a lot of my better work for GM puzzles these days - and that doesn't just mean twisted symmetry either...

Bad news: I forgot to post last week.  Good news: I'll post twice this week! Also, I managed to win* myself another nikoli time trial ...

Here's a puzzle called Shakashaka.  This one started off with good intentions and an interesting idea, but for now will make a good exam...