There is a lot of variation here. All the rules seem to agree that you get a Risk card only if you conquered a territory during your go, and that you can cash them in in sets of 3 of the same symbol or 3 all different symbols. (The pack includes 14 of each symbol plus 2 jokers which can be used as any symbol.
A joker plus any other two cards can thus form a set, and any 5 cards must contain a set.) The U.K. rules offer two methods. The "standard" scheme is: A set of 3 Artillery is worth 4 armies A set of 3 Infantry is worth 6 A set of 3 Cavalry is worth 8 One of each is worth 10 Jokers are of course almost always used to make sets of one of each. This scheme means it is impossible to gain huge numbers of armies in one go unless you control most of the board.
It also tends to give little incentive to hold your cards once you have a set, unless you have a chance of improving the value of the set. (Once you have 5 cards you must have a set, and must play a set at the start of your next ... more.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.