It's free right now. I picked it up last night played it this morning. It's definitely worth downloading. It's a surprisingly good puzzler. If it wasn't free, I wouldn't have downloaded it. I thought it looked pretty cheesy. The dev would be wise to remove "the new sudoku" from the title. It doesn't fit the game and it made me ignore it until it was free. Definitely worth trying out, though. I'm liking it a lot so far.