Rebecca and her friends are at a gymnastics gym to build the world's largest fort as a challenge. Unbeknownst to viewers, their real intention is to find Rebecca's doppelganger (referred to as "RZ twin") who they believe is also in the gym. Throughout the challenge, they try to make their actions look normal while secretly searching for RZ twin. They successfully build the fort, but RZ twin is not found during the challenge. However, in a surprising twist at the end, it's revealed that RZ twin is actually in the gym and has been watching them. She's revealed to be trying to learn gymnastics to mimic Rebecca and is planning to meet with the "Game Master." Rebecca and her friends discover that RZ twin has regained her original identity and is no longer pretending to be Rebecca. The video ends with a cliffhanger, setting up a potential future confrontation.
Here are the key facts extracted from the text:
1. The video features Rebecca and her friends at a gymnastics gym.
2. They are attempting to build the world's biggest gymnastics fort.
3. The challenge involves building the fort and performing gymnastics skills on different apparatuses every two minutes.
4. The group is also searching for Rebecca's twin, referred to as "RZ twin".
5. Rebecca's twin is believed to be in the gym, but her location is unknown.
6. The group is trying to make their challenge look normal to Rebecca's twin, who might be watching.
7. Rebecca's twin is said to have been affected by something the "GM" did to her.
8. The group is trying to find Rebecca's twin and figure out what happened to her.
9. They use a camera to search for Rebecca's twin in the gym.
10. The group completes the fort and makes it 20 feet high.
11. After completing the challenge, Rebecca's twin is revealed to be hiding in the gym.
12. Rebecca's twin is trying to learn gymnastics to impersonate Rebecca.
13. Rebecca's twin plans to meet with the "Game Master" and has placed a tracking device on her.
14. The group is unaware of the location of the meeting between Rebecca's twin and the Game Master.