Peng et al. provided additional evidence on how game features that increase (or don't) need satisfaction to prior literature (Przybylski et al., 2010; Ryan et al., 2006).

Game features supporting need satisfaction of autonomy:
- greater likelihood of game recommendation
- greater game enjoyment
- greater motivation for future play
- greater game rating

Game features supporting need satisfaction of competence:
- greater  game enjoyment
- greater likelihood of game recommendation 
- greater self-efficacy for exercise using the game
- greater game rating

Outcomes that were unaffected:
- self reported effort exerted in gameplay

What affect did exergame features that increase basic need satisfaction have on motivation and engagement? (SDT/CET) (Peng et al. 2012)

 Need satisfaction of autonomy:
- Choice for avatar customization
- Choice of how to grow the strength of the avatar
- Selection of how to respond to non-player characters (dialogue branching)

Need satisfaction of competence:
- Adjustment of difficulty level based on player achievement
- Indicators for players to see their achievements (e.g. heroism meter, achievement badges)

University of Michigan - Ann Arbor

Peng et al. (2012) recognized that there had not been much prior study done on how game features affect an individuals satisfaction of basic needs and conducted a study to analyze what affect different features would have. 

Intro to exergame features influencing SDT desires (Peng et al. 2012) 

Peng, W., Lin, J. H., Pfeiffer, K. A., & Winn, B. (2012). Need satisfaction supportive game features as motivational determinants: An experimental study of a self-determination theory guided exergame. Media Psychology, 15(2), 175-196.

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