If all you want is the minigames, you want the modified .dds files. Place them in data/gfx/gui
You can either:
Install fantasia/tiara (will have a bunch of other stuff too)
Or
Just add these to your data folder:

IF AND ONLY IF you use fantasia (for the auto data read feature).
Or
If you do NOT use Fantasia, put those in your data folder, and run a data packer. If you need one... I'll dig up a link. I doubt anyone needs one. Use fantasia instead -_-