UXDon't throw the pit at the player before you've shown them there's a pit.
The design principle of introducing complexity gradually, letting users build competence before raising the stakes. Level 1-1 of Super Mario Bros. is the textbook example: every mechanic is taught before it can kill you. Good products never ask you to prove you understand something before letting you try it.
A design principle that introduces complexity gradually, letting users build competence with simple mechanics before raising the stakes.