@AMIR-GAMES As @NeilSenn says, there are no restrictions to behaviours available in the free Starter version, or the paid version of hyperPad. All behaviours are available to all users. Especially one as critical to game development as collision detection. We have gone through a series of updates and changed names of behaviours, so if you look at old tutorials or videos, you may see the behaviours by different names. In this case, the "Collided" behaviour is now called "Collision Event"