noun
A professional who designs the rules, systems, and player experience of a video game. Loanword from English 'game planner', but the standard English term is 'game designer'.
from English game planner
彼は大手ゲーム会社のゲームプランナーとして働いている。
He works as a game designer at a major game company.
ゲームプランナーになる
To become a game designer, you need planning skills and programming knowledge.