Here's one base on Battle Royale. (That one movie/novel/manga where a bunch of Japanese students have to kill each other.)
All players are on their own and have killing powers with different effects.
Everybody has their own weapon so no Lynching.
Players can make alliances with each other by PMing the GM, some abilities can only be activated though the use of being in a group.
Examples of group only abilities
Poisoning food
Haxxing the system
Some roles are on their own and cannot join a team.
Examples of Solo roles
Crazy killer student
There must be at least one person dead at the end of each round or one will be randomly selected to die.
Each player must choose a zone to stay for the night.
Certain places provide protection from certain weapons
Example of Zone effects
Sleeping in the Forest Zone keeps you safe from the Poison, Baseball bat, and Sickle Killer, but leaves you open to anyone with a ranged weapon like a Crossbow of a Gun.
Players may only target other players in the same zone as them.
Mod will post a list of all the Zones and which people are in them.
The advantages and disadvantages of the Zones may be posted if the mod choose to do so.
Each day a zone will become a danger zone, this will push out anyone in that zone and they will have to move to another.
I'd like some constructive criticism on this please.
Refer to this for relations to the plot and story. Link
EDIT
Is there something wrong with the links?