Playing with more than one at the same time (NG+) allows for advanced options and a more complex experience. May not be your style or speed, but if the the enhanced challenge appeals to you, I encourage you to try it!
The rewards are more pleasurable in games: you get points or a short movie as a reward instead of a needle in your leg (i was NOT a fan of flu shots. I appreciate them now)
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https://www.youtube.com/watch?v=BxCGiUnbjQg