This was not only a complete mobile template of a classic game but also can be worked as a drag-drop widget for your 3d/2d games
The complete project that you can reskin and upload to AppStore or google play store directly.All the skin were flat style which you even can do the job without an artist.
Basic rules:
Drag the puzzle piece on below section and try putting them upon to fill the board. When parts were intersected, you would not be able to put it down. There would be a red frame flashing under your grabbing piece which indicates the current rectangle area of your dropable area.