Chain Puzzle: Tabletop Games #04 - Mansion Massacre

_{This is the fourth Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The answer to this puzzle is a thematic word or phrase. The solver whose answer is awarded the green checkmark has first refusal on the opportunity to create the next puzzle in the series, which must somehow incorporate the answer to this puzzle somewhere within its construction. The solver is under no obligation to create the next puzzle – in the event that the solver does not wish to take up this opportunity, the puzzle’s setter may take up the offer of a willing substitute setter or choose to continue the chain themselves.}

Six guests, Miss Scarlet, Mr. Green, Colonel Mustard, Professor Plum, Mrs. Peacock and Mrs. White were invited to a party hosted by Mr. Black in his mansion. You’re a detective that has to solve the murder case which occurred during this party, or shall I say, the murder cases? All of the people who participated at this party are dead, including Mr. Black.

There are multiple oddities scattered around the mansion. It’s almost as if the killer wants us to find out what exactly happened! Which is why we can secretly assume for the sake of this puzzle that there was only one killer, and that killer was one of the people mentioned above (which also means they killed themselves at the end of it).

Your job is to find out

1. Who the killer was
2. Why the murderer killed each person individually, including themselves (there’s a different motive for each).
3. Which weapon was used to kill each person individually, excluding themselves.

and ultimately

Which game the killer wants you to play at your next game night!

Here are the case files:

Colonel Mustard was found dead in the hall. Beside him, an oddly arranged set of weights lied on the floor (shown below), accompanied by a note that reads My choice of weapon was easy for this one: Take an australian piece of wool and ship it to a country in Europe.

Mrs. White was found dead in the conservatory, accompanied with a note that reads OXXXOXXXOXOXOXOXOOXXOOXOXOXOXOOXOOOXXXOXOXOOXOOOXOO and a further note that reads I always noticed her looking at me. Oh, which weapon? The one which hasn't been used yet :)

Mr. Black was found dead in the library. He appeared to be reading a book called "Army N", accompanied with note that reads I twisted and moved this xenophobic, vain, irritating idiot down the drain with guidance.

Mrs. Peacock was found dead in the ball room, accompanied by a note reading IXCRAJEOUWBYFLPHNSZQMKTDGV and a further note that reads She died due to a logical conclusion

_{Fixed error above in edit – Was mostly cosmetic}

Miss Scarlet was found dead in the lounge. There was simply a note reading She didn't feel like it, but I didn't either, so I made her do it.

Professor Plum was found dead in the dining room. An odd arrangement of bottle caps were placed on the table (shown below), accompanied by a note that reads That monkey was really enjoying nasty christmas ham.

Mr. Green was found dead in the billiard room. A small table seems to display an ongoing game of Blackjack (shown below), accompanied by a note that reads I let him play a better game with higher stakes.

_{Chain Puzzles are a novel approach to puzzle series creation, in which the solver of the previous puzzle in the chain becomes the setter of the next.}

_{The answer to the previous puzzle (which provided the theme for this one) was:}