I am a reality TV show that involves high-stakes challenges and strategic alliances, where contestants compete for a substantial cash prize. Which show am I?

1. The show often involves physical and mental challenges testing endurance and problem-solving skills.
2. Contestants are typically divided into groups, requiring teamwork (or the appearance thereof) to succeed.
3. Hidden advantages and surprise twists are common occurrences that shake up the game.
4. Betrayal and backstabbing are often considered part of the strategy to advance.