I was wondering if it was possible to install the outdoor basketball court kits on relatively flat grass rather than concrete?

We don't recommend installing our Outdoor Sports Tiles over grass, but many of our customers have done so with success. The best subsurface to install our court tiles on is concrete, but if you have a flat piece of ground, installing our sports tiles on it, shouldn't be a problem. The main issue of installing on direct ground is that the tiles can sink into the ground after a rainstorm. Also, since the ground is not totally stable, if you were to fall hard on the tiles, you can push the tiles into the ground. Another issue that can pop up is that the tiles will buckle due to not being able to expand and contract properly.