Detailed Instructions: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Problem:Question: What does "I'm game" mean and what is its correct usage? 
Answer: I'm game means that I am up for the challenge, but arguably more commonly, I agree... Q: Fancy going for a drink? A: Sure, I'm game... or Q: I was thinking of going shopping. Do you want to come? A: Yes, I'm game... As for correct usage, as with most idioms, use it as you will... there is no correct usage as such.
Solution:
yes