It was working before, now it just won't start.

Zen of Sudoku is now free-to-pay, but I want to to bind it to my account. Is there any shop where I can buy a Steam key?

When a player fills in a square you should probably make it so that all the numbers that were previously penciled in in that square are removed.

Crowded here huh? Steam achievements would be dope. I need to feel I'm getting somewhere in my life.

Is anyone else having an issue with ZoS not wanting to enter Full screen mode and constantly remaining in the window mode? I can not get full screen to work at all I uninstalled it and reinstalled it again, still it Will not go into Full screen, If anyone has run into this and knows how to fix it please let me know....