Answer:
Challenge
Step-by-step explanation:
Challenging activities tend to be a great motivator for people. This happens because many people get satisfaction from having to overcome some particular level of difficulty and find it rewarding to being able to overcome this difficulty and continue on.
In the example, video game players state that they "enjoy finding new and creative ways to work through video games" and "find very rewarding to get to the next level".
Both statements indicate how much they enjoy the challenge of coming up with creative solutions or ways to get to the next level and they find this rewarding. Thus, we can say that they see video games as a challenging activity and view challenge as a motivator for engaging in game playing.