Sentence:  ‘They're Twitch Games,' he grinned, ‘arcade games. An adventure game is one where you use your mind; if you can type, you can play an adventure. If you require anything other than that, you've got a twitch game — an <WSD>arcade game</WSD> — where your skill of movement is more important than your thinking. ... 
Meaning of the word marked with <WSD> tags:  A game for a computer or console that shares traits of coin-operated video games, such as short levels, simple and intuitive controls, and rapidly increasing difficulty.