What are the relationships between English ability, online gaming experience, learning performance, and anxiety?

Effects of Prior Knowledge on Learning Performance and Anxiety in an
English Learning Online Role
Playing Game

How does learners’ prior knowledge (in terms of levels of English ability and online gaming experience) affect their English learning performance in DGBL?
How does learners’ prior knowledge (in terms of levels of English ability and online gaming experience) affect their anxiety of English learning in DGBL?
What are the relationships between English ability, online gaming experience, learning performance, and anxiety?