Lead the game
Evaluate completed tasks by giving points and feedback. You can make an evaluation guide or model response visible only to you, when you create a game. Evaluations are saved on the platform.
If you are not happy with the answer, you can return it to the students to be done again. But be sure to be encouraging - the goal is not only to learn, but also to create sense of achievement. When students get feedback and exeprience feelings of success, they start to trust their abilities more.