Pay games are exactly what they sound like. You pay for the story and you can play it over and over again. They have no social aspect, dress up, or missions. Also, since you have purchased them, you can play the games over and over again, making different choices until you get the ending you want in one go!
Some games have Bad Ends that are varying degrees of bad from “you don’t get with the love interest” to “you die horribly.”
Pay games are available on several platforms from PC to Console to Mobile.