tetris chess -- 2

I need a modification to a game already running in Unity 3D. (https://github.com/cbpetersen/tetris-unity3d) It is a Tetris written in C# with autoplay. AI with code ready to modify like in the videos. In the first video the existing version. In the second the modified version with a person playing against the AI (the mechanics of the second video are available in unity3d without AI)