TCG = trading card game. Basically you trade cards with others, play games and enter contests to complete your favourite sets.
I believe someone by the name of Calico came up with the idea but, alas, their site is no longer around.

I got bored with building fanlistings, I wanted to branch out a little. I remembered stumbling upon a Lord of the Rings TCG a few months back and started looking around. There were quite a few TCGs floating about but, to the best of my knowledge, none dealing specifically with comic book characters. And so Marvel-lous was born January 2005.

You begin with a starter pack containing:
¬4 cards from a set of your choice
¬4 random cards

You can trade cards with others or play games and enter contests to gain more.

Standard cards are worth 1 card towards your total and when trading.
Special cards are worth 2 cards.

When you refer someone you recieve:
¬2 random cards

On you birthday and on other special occasions you recieve:
¬Occasion card
¬2 cards of your choice
¬2 random cards

Occasion cards count 2 to your total but are personal and therefore cannot be traded.

You begin on level one and for every 25 cards you collect you advance one level.

When you move up a level you recieve:
¬Level Badge
¬2 cards of your choice
¬2 random cards

Once you have all the cards in a set you have mastered it.

When you master a set worth 20 set you recieve:
¬A personalised mastering badge
¬2 cards of your choice
¬4 random cards

When you master a set worth 10 you recieve:
¬A personalised mastering badge
¬1 cards of your choice
¬2 random cards

TCGs - Calico
Puzzle - Bunny
Puzzle game - Crys-Chan
Quotes - West of the World
Corrupted Card - ?
Who's This? - ?
One-a-day - No lies
Trading Pot - Kajouka
Word Scramble (granamas) - Moony
Lottery - Sepia
Pick a item/number (Spidey's Surprises) - Nine Companions/Jen?
Go Fish - Through the Fire

Have I missed one? - tcg[at]snowcovered-dreams.net

Since I make all the games (at the moment) I obviously cannot win them as I know all the answers!
Instead (when I remember!) I take two random cards a week and a random card from every set I make.
Does that seem fair?