Addictive but one problem – Blockudoku - Block Puzzle Review

I enjoyed playing so much I bought it to avoid the lag time created by ads. I play daily up to an hour straight. The game needs one alteration. A back key or arrow. Occasionally my disabled hands inadvertently put a puzzle piece on the wrong square, but I have no way to rectify this.
Review by ewdappleman on Blockudoku - Block Puzzle.