The game promised it was free, but the child's parents soon found themselves doing what for microtransactions?
Options:
- costly
- captive
- contained
- paying
- caught
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Microtransactions are a business model where users can purchase virtual goods with micropayments.
So, the final answer is paying.