Aims to sell in retail similar to Apress' GameMaker best sellers: The Game Maker's Apprentice (ISBN: 978-1590596159) and The Game Maker's Companion (ISBN: 978-1430228264).
Game development / programming are highly relevant memes in ebook subscription services like Safari for revenue purposes there.
GameMaker is or has been the leading 2D game development engine and platform in most venues (NOTE: cocos2d is leading 2D engine in Apple iOS mobile...