Game designer
A game designer is someone who designs games. The term "game designer" usually refers to someone who designs computer or video games, but can also be a person who designs older games like a board game.
Game Designer Media
A paper prototype made as part of the design process of the video game Diamond Trust of London
Charles Darrow's 1935 patent for Monopoly includes specific design elements developed during the prototype phase. Prototypes are very common in the later stages of board game design, and "prototype circles" in many cities today provide an opportunity for designers to play and critique each other's games.
A set of poker dice and a dice cup
All casino games are designed to mathematically favor the house. The house edge for a slot machine can range widely between 2 and 15 percent.
Video game prototypes created during the pre-production design phase are often used as a proof of concept for the implementation of new rules or gameplay features.
H. G. Wells playing Little Wars