What is Incognito?
Every player in Incognito is given an identity and an agency.
The identitys are labelled according to the Basic Military Alphabet (Example: Agent Alpha, Agent Bravo, etc).
The agency is the mysterious spy organization the player belongs to. And actually, each agency sent TWO agents to finish the job... though without telling them who is the other one. Agency names are made of a color and a noun starting with the same letter as the color (Example: Red Rabbits, Green Goons, Blue Bartenders, etc). At the beginning of an Incognito round, the names of the agencys will be revealed, as well as their relationships.
Those relationships make up the goal of Incognito: Kill the opposition. Each agency has a single target, namely another agency. A team of players (aka an agency) wins the round if they succeed in killing both players of the opposing agency. However, the relationships are always arranged in a circle (Example: Agency A wants to kill B, B wants to kill C, C wants to kill D and D wants to kill A), which means that, at any time, you're hunter and prey alike.

What do players do?
Quite simple: Trying to figure out who's who.
Every day, there are x packets of information (wherein x equals the number of agencys) semi-randomly generated (this means the information is random, but equally spread out across all participiants). Packets are labelled by their round number and a letter (f.e. 1A, 1B, 1C, etc). Each packet of information contains two rumors, from which one is true, whilst one is false. Example rumors could be:
-Player iownzyou belongs to Agency Black Bussards.
-Player omgawwwwd is Agent Bravo.
By combining their own knowledge, the rumors and actions of other players, it's the player's job to figure out the real informations.
Every round (aka, one day of 24 hours), every player is given one packet of information (via PM) by the game admin. In total, only two of the x aviable packets are given out. The first player of an agency receives one of those two packets, the other player the second one.
As well, players can (next to speculating in the thread or PM'ing potential allies) chose from one of a few distinct actions (by sending the Game Admin a PM):

1. Gather rumors
   Players can choose to receive another information packet from the ones avaible for the present round.
   Information packets are specified with A to ... and are equal in number to the amount of Agencys.
   Players must specify which packet they want to receive.
   
2. Visit the ambassador
   The ambassador is a very informed and yet very talkative man. Attending to his open dinner will always yield the rumors of X information packets (X is to be replaced by number of participianting agencys / 2, rounded down).
   However, since it's an open dinner, this means that all players attending will be given a list of all other player names and identitys who attended as well. These lists are seperate and will not reveal which player has which identity though (and the more people attend the dinner, the smaller the chance of successfully gaining information).
   All players receive the same information packages from the ambassador's dinner. None of the information packets can be one of the two given out for free at the start of each round.
   
3. Attempt a murder
   And this is the way to actually win the game: Attempt to murder a specific agent. Yes, this means you need to target an identity to kill a player... which means you first need to figure out what said identity of your target actually is.
   However, all agents are specialists at avoiding assassinations and accordingly it's not easy to actually kill one of them, if not the opposite.
   Players individually announce (to the game admin) their murder target. Once the round finishes, something happens, depending on the number of people who actually attempted to murder:
   If only a single player tries to murder an agent... the attacking player dies and his identity (though not agency) is revealed. Trivially, dieing = loss. The target is informed about said player trying to murder him.
   If two players try to murder a target, the attempt fails. The target is informed about the attempted murder, though not being told who was part of the plot.
   With three or more players, a murder is always successfull, eliminating the target and revealing it's identity. Additionally, the murderes will be informed of the target's agency.
   However, if there are more then three agents involved in the kill, stuff get's messy: For each additional agent (past 3), one of the attackers name and identity is revealed to another attacker.
   It is possible for an attacker to kill a target and be killed by another plot in the same round. Actually, it's possible that you may be killed be the target you have just killed.
   There's an additional rule to prevent stalemates: There's a counter incrementing by one for each passing round. Whenever the counter reaches the number of still active players in the game, it will reset and all future murder attempts will be made 'easier' by one point. Assuming eight players are still alive after eight rounds, in the ninths rounds a single agency (two players) can successfully kill any person they chose. This Sudden Death rule ensures the game to end at some point (at which even a single player can kill anyone else, most likely resulting in all remaining players to die at once).
   
4. DEFAULT: Loiter
   If the player does not specify an action by the end of the day or just wishes to loiter, he will sneak through the night, trying to figure out what other agents are up to.
   To be precise, all loitering player will be given a list of activities of all other agents. The list will label who went to the Ambassador's dinner, who was as well loitering around and as well who plotted a murder for that night (and indirectly it will not list those agents who are busy gathering rumors). However, the list does only label those activities in correlation with IDENTITYS, not the actual player names.
   
5. Visit the archives
   Visiting the local archives can grant some important insights on the past, exspecially in regards to vital data and rumors.
   Checking the archives permits the player to gather one rumor package from each individual day that has already passed and is at least two days in the past.
   Example: Using archives on day 3, the player can select one packet from day 1.
   Example2: Using archives on day 6, the player can select one packet each from days 1 to 4.
   A player does not need to specify packets for every day (in case he already knows all packets of that day). Not specifying a packet for a day will, however, not yield any packet for that day.
   

Oh god, this is so complex, are there any tips?
Of course:

Victory/Loss conditions:
If you die, you have lost. Even if your teammate afterwards manages to kill your targets (and yes, losing your teammate does not mean you have lost, you can still win). As well, dieing in the same round as the last of your targets dies still counts as a loss.
If you think you have succeeded to kill the two players of your target agency, you may state so in public, during any time, in the thread, revealing your name, agency and the claim that you killed your target agency, together with the two names of the deceased targets. In case you're claim is correct, you and your partner win the game. Otherwise... you will be told you're wrong... and have just revealed your agency alignment to your pursuers. (And this is a good reason not to reveal your identity in that claim until the game admin confirmed you have won the game.)
There will be a score-board noting the successes (and failures) of all players involved:
-Winning the game by eliminating both targets by murders in which at least one person of your agency is included, and as well surviving the round together with your teammate is considered an ACE, granting 10 points.
-Winning the game by surviving together while both of your targets die (by whatever means) grants 8 points.
-Winning the game alone still grants 5 points.
-Surviving the game (by means of somebody else achieving his goal), whilst one of your targets is dead, grants 2 points.
-Surviving the game (without having accomplished anything) grants 1 point.
-Being killed, but only after taking down one or two of your targets, will still net you 1 point (your teammate may cash in 5 points though).
-If you die with both your targets alive... well, zero points for ya.