Sudoku Jigsaw 10% launch discount, Sudoku Universe - 75%

https://store.steampowered.com/app/858040/Sudoku_Jigsaw/

http://store.steampowered.com/app/733070/Sudoku_Universe/

Sudoku Bundle:
https://store.steampowered.com/bundle/6448/Sudoku_Universe_Bundle/