Low fidelity prototype (also low-fi)
Low-fidelity prototypes allow us to quickly and inexpensively test ideas, so we can validate our hypotheses and improve our solutions.
High fidelity prototype (also high-fi)
High-fidelity prototypes are highly detailed, interactive representations of a product that closely resemble their final design.
Onboarding
In game design, onboarding refers to any interaction, tutorial, prompt, or experience in which learning takes place. They are at the beginning of the game and this word may be used to speak at the same thing as First Time User Experience, even if the user can find tutorials later in the game.
First Time User Experience
This is what user feels when they start and interact with the game for the first time.