I designed this for my coworkers and after many iterations, this design seemed the most accurate. The hole is regulation size and the outcome of your shots should be close to what you would expect to happen with a real hole at at least a few meters away. If you hit too hard, the ball will pop out. The block at the back of the hole was added to stop the ball nicely when your shot is dead on. We added some hook-side Velcro to the bottom to help hold its place on low pile carpet but it isn't completely necessary.