Monaco

Monaco has two identical decks of 54 cards. 52 of them have:

Traditional playing card ranks and suits in the upper left corner (e.g. King of Spades)
A one- or two-letter prefix in the upper left corner (copied in small print above the card's rank).
Four suffixes of 1-4 letters listed below the card's suit along the left side. Each suffix is printed in either black, red, green or brown ink; the mix and order of the colors varies from card to card, so the color is probably significant but the pattern is hard to discern.


The remaining 2 cards contain a list of 300 words, each of which is a combination of a prefix and a suffix from the other cards. These words actually look mostly like nonsense words and are likely a set of names, perhaps associated with Monaco.

It looks apparent that an important part of the game is to combine cards so that a prefix and a suffix combine to make a word in the list. But the game's mechanics, the meaning of the different colors, and even its publication details are unknown until a copy of their rules can be found.

—user summary