Hexologic Steam key..
Added 2018-06-19 19:22:01 +0000 UTCSolve challenging, yet rewarding puzzles, listen to relaxing music, dive deep into the game’s atmosphere and fall in love in with Sudoku again.. apparently.
Key is: X0686-ZHR8Y-4T54T
Store page on Steam: https://store.steampowered.com/app/785890/Hexologic/