The free version allows you to make your own games without having to pay anything, it's very intuitive and easy to use as well. It has several options that allow customization according to needs. I have not found any particular problem in this program so far. They could add more features but i think they are doing what we want them to do. A good tool if you need some help or just looking for something fun. Making simulations and creating my first 3d project which was really cool! We used it to teach our children how things work by making their own house models and other projects.