Good idea, but needs improvement

Did one puzzle of 83 pieces on my Iphone. Very difficult to control the movement and placement of the pieces. I mean to aim a piece to its designated position can drive you nuts: you drag it with your finger, which coves the piece completely and you cannot see it, if you zoom in then the slightest movement of your finger sends it so far up and down that it takes huge amount of micro movements and concentration to move it. If you remove your finger, the piece springs back to its position somewhere in the chaos. You can rotate pieces only off the board and drag it to the board to place it exactly as you set it while it was off the board. Too time consuming, to the point that it kills the fun of the idea.

Efskyblue about Jigsaw Puzzle 500+, v1.5