Machine generated contents note: Traditional Classroom Assessments Are Detached Events -- Traditional Classroom Assessments Rarely Influence Learning -- Traditional Assessment and Validity Issues -- Digital Games, Assessment, and Learning -- Evidence of Learning from Games -- Assessment in Games -- Stealth Assessment -- Stealth Assessment in Newton's Playground -- Conscientiousness Review and Competency Model -- Creativity Review and Competency Model -- Conceptual Physics Review and Competency Model -- Relation of Physics Indicators to Conscientiousness and Creativity Indicators -- Newton's Playground Study Procedure -- Discussion and Future Research -- Appendixes -- Appendix 1 Full Physics Competency Model -- Appendix 2 External Measures to Validate Stealth Assessments.