Harry Potter for Kinect

The challenge mode is first unlocked when you complete the main storyline. Casual Challenge mode is available first, completing Casual unlocks Advanced and completing Advanced unlocks Extreme.

Each of the challenge modes consist of 3 tiers of mini games for a total of 6 games. They are all variations on the storyline games with specific requirements. Starting the challenge mode gives you access to the 3 low tier challenges. Completing all 3 of those gives you access to the two middle tier challenges and completing those unlocks the final tier and the final challenge. Completing the final challenge unlocks the achievement for completing the challenge mode.

I won't go into detail for each challenge however the requirements are very clearly laid out. Many of the games require a minimum number of something however the game continues until you fail it. For example Dodge 55 obstacles in the Tri-Wizard Maze is one of the Advanced Challenges. The game will continue after you have dodged the 55th obstacle however at any time after this you can hit an obstacle to end the challenge and it will count as complete.

A couple of the spell casting challenges do have a finite number of targets so if there is no clear way to fail continue until the challenge ends. The third way for a challenge to finish is a timer. If the challenge has a time limit simply continue until the time runs out. The game does have the requirement and your progress clearly displayed as you play the challenge so it is easy to see when you have reached the passing mark.