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[Independent Variables] 
   |
   |----> Type of Instructional Approach
   |----> Game Design Features
   |
   v
[Dependent Variables]  
   |----> Student Learning Outcomes
   |----> Student Engagement
   |
   |
[Moderating Factors]   
   |----> Student Learning Styles
   |----> Game Complexity
   |
   |
[Mediating Factors]    
   |----> Prior Knowledge
   |----> Teacher Facilitation Style