Friday Puzzles #288

That moment when you realise Christmas Day is also a Friday!

Nothing too taxing today as this was rather a last minute affair, but watch your step!  Each of the four shaded regions follows a different rule:

• odd
• even
• fortress
• renban group

Merry Christmas to all my dearest readers, and as ever, enjoy!

EDIT: I'd managed to leave a couple of clues out.  This should make things a little easier!

    #328 Mini-Matchmaker Sudoku – rated medium

All puzzles © Tom Collyer 2009-15.