GameMaker is a great choice for an in-depth unit or entire course on game design. Other game-making lessons from Code.org or Scratch can see faster results on the basics, but after a few hours, teachers and students who are looking for a game-making environment with substance will want more. Use the lessons to get kids started.
Common Sense: GameMaker
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Resource Link: https://www.commonsense.org/education/reviews/gamemaker