The Basics
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Each "week" one person is elected as the Grandmaster.
The Grandmaster selects a specific number of people (depending on how many remain in the game) to serve in his Inner Circle. Those in the Inner Circle, and the Grandmaster, each must select one player (who is neither the Grandmaster nor in the Inner Circle) and give them the "Cursed Mark".
The remaining contestants who are neither the Grandmaster, in his Inner Circle, or have been given the Cursed Mark, vote to expel one of the contestants who are up for elimination.

In Depth
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Part 1: Each of the contestants privately rank their fellow contestants, not including themselves, in order of who they most want to be the Grandmaster.
Whoever receives the highest average ranking will become the Grandmaster. This process has a limit of 24 hours, but as soon as all the rankings are sent in the result will be revealed.

Part 2: The Grandmaster will select a specific number of people to be in his Inner Circle. (2 if there are 12-8 players remaining, 1 if there are 7-5 players remaining.) The Grandmaster will act alone in the F4 and F3. This process should be very quick, as the chosen Grandmaster will have had a lot of time to think prior to being chosen

Part 3/4: The Grandmaster and the members of the Inner Circle will each send in their top 4 picks for the Cursed Mark in order(will be revised as the numbers dwindle). The members of the inner circle are independent from the Grandmaster. They can do what they want to do, and the Grandmaster can do what he/she wants to do. Their decisions will be revealed publicly

Part 3/4: While the Grandmaster and members of the Inner Circle are strategizing and making their decisions, the remaining contestants will all participate in a non-live competition. The winner will receive immunity from the Cursed Mark. The winner of immunity will not be announced until the Cursed Mark ceremony (this is the reason why the Grandmaster and members of the inner circle must send in their top 4 picks, just in case one of their picks wins immunity and their others are chosen already.)
Parts 3/4 will be given a 24 hour period, if everything is received early there will be an early reveal.

Part 5: The remaining contestants, including the immune contestant but not including the Grandmaster, members of the inner circle, and those with the Cursed Mark, all privately vote to eliminate one of the contestants with the Cursed Mark. Whoever has the most votes to eliminate will be eliminated. If there is a tie, the Grandmaster will break it. 24 hours, revealed early if received early.

Rinse and Repeat until the F2 (F4 and F3 will follow the Big Brother style, with a competition to decide the Grandmaster.)

Follows a jury format. The final 7 people eliminated will vote for a winner from the Final 2.

Additional Rules
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If someone is selected Grandmaster one week, they cannot be the Grandmaster the next week. However, they can be a part of the Inner Circle.

Same goes for members of the Inner Circle. You cannot be a member twice in a row, but you can be selected Grandmaster the following week.

You can win immunity as many times as you can, but immunity is offered for the last time at F6.

The Cursed Mark only lasts for the week it is given to you. If you survive elimination, you have a clean slate.

I know this all seems quite complex, but it'll all make sense once we start.

The Rags to Riches (R2R) twist.
This twist will only occur on pre-selected weeks. Here's how it works. Contestants will be informed that the following week will be a R2R week.
The eviction for that week will occur as normal, a person will be evicted.
But instead of a Grandmaster vote for the next week, the nominee with the second most votes to evict will automatically become the Grandmaster. They will then pick the members of their Inner Circle and the week will continue as normal.