Start by selecting whether you want a simple card game, a board game, or an action game. The type will determine the rules and difficulty level.
Create a grid or layout for the game. For example, a triple a game might have three rows of cards.
Establish clear rules for how players take turns, what constitutes a win, and how points are awarded.
Play test the game to identify flaws or areas where players may get confused. Adjust the rules accordingly.
A triple A game should be easy to learn and play. Simplify the rules and focus on fun rather than complexity.