Wings of War or Blue Max
An alteration that gives more realism to this game, and which may be applied to all games requiring flying objects, lies in let hanging the above objects in space.
Apart from the difficult suggestion of playing into the Space Shuttle or in other space ships, we are limited to apply the technique already tested during the making of the “Apollo 13” movie.
Basically, you have to move within the 30 seconds during which the military jet (where you decided to play) dives, generating a no gravity effect.
If you managed to obtain this, you won’t have problems finding a method to keep all game materials at the right distance at the end of the dive.

The Lord of the Rings
Sauron should corrupt and destroy all the hobbits he reaches. Thus, find the original mould used to make the hobbit miniatures, fill it with chocolate and paint it with edible colors.
When the Sauron token reaches one of the hobbits, the player impersonating Sauron (if you are playing with the expansion) literally eats it. If there isn’t a player impersonating Sauron, the hobbit must be eaten by the player who was controlling it, but only after dipping it into the coffee (the well-known coffee with a dash of hobbit).

Euphrat & Tigris
As you already know, in this game the cubes gained by each player and the remaining tiles are hidden to avoid the “analysis paralysis”. Well, someone could remember exactly both of them, and maybe slow down the game to deeply evaluate the situation.
To avoid the counting of the cubes, give him a headphone connected to a tape recorder, with a tape where you have previously recorded voices saying incessantly “How many cubes I had? They were three? Or maybe five? Do I have red cubes at all?”. Given the expected game length, it is wise to get a recorder with an auto reverse function.
To avoid players remembering accurately all discarded tiles, causing the aforementioned analysis paralysis, it is enough to cunningly let pass a month and a half between each move, so that the memory of the game status vanishes.

Settlers of Catan
Is it fair that someone notices the height of the raw materials card tiles, to choose what he will ask thanks to a “Monopoly” special card? If you think it is not, it is sufficient to insert a small black hole in the game box. Keep the discarded cards in the black hole, so that nobody could count them. It is valuable to play with Stephen Hawking, who can help you if you need to draw a new card from the black hole.

Samurai or Aladdin's Dragons
Both these games sport tiles that are visible to all, and some eagle-eyed player could discern them by little flaws. The solution is simple and neat: just give each player handy ground-glass glasses, which you had previously suitably treated with a sharp machete. So, every player sight will be so blurred that it will be impossible to spot any little imperfection on the tiles.

El Grande
What is the point in hiding the cubes in the Castillo when someone is counting up your remaining Caballeros as well as your Caballeros on the field?
Put the heap of Caballeros in a blender and switch it on: uncork the blender when you have to take the Caballeros out of the reserve, and use a butterfly net to pick them up, putting again into the blender all Caballeros other than yours.

Bang!
When around the table there are Outlaws and Renegades, someone is easily bluffing. One of the simplest ways to cheat is to absently move the card used to mark the remaining life points of your character with your elbow.
To prevent this trick, add to the game box a common drift. Each time a character gets a wound, physically make a hole in the card, similar to a bullet hole. Of course, you will have several decks handy to replace the various characters literally riddled by the drift.