SDLHana

SDLHana is an SDL card game which uses the Japanese Hanafuda
(flower cards) deck. The default game is Koi-Koi (come on).
There is also a version of Koi-Koi for betting. And also an
option to play the Korean Hwatu (Go-stop) variation that has
some different rules. 

There is a steep learning curve because Hanafuda cards are not
like western card decks with four numbered suits. The Hanafuda
deck has 12 suits without numbers and only four cards in each
suit. Each suit represents a month with a different flower.

The 12 suits are:

Pine, plum blossom, cherry blossom, wisteria, iris, peony,
clover, pampas, chrysanthemum, maple, willow, and paulownia.

The card images can be somewhat abstract and not easy to identify
at first. If you are not familiar with some of these flowers,
look at the HanaSuits.jpg file for a preview of the deck.

A total of 8 cards are dealt to you, 8 to the computer player,
and 8 are placed face up on the table. The rest are left in the
deck.  

The object is to score the most points. To get points you need
to capture special card combos known as yaku. But before you
can get points, you need to collect the cards that form a yaku.

You take a trick by selecting a card from your hand, and matching
it with a card of the same suit on the table. If you cannot match
the suit then the card you played stays on the table for the next
play. After playing a card from your hand, the top card on the deck
is turned face up and automatically played for you (if it's your turn).
Sometimes the computer will wait for you to choose the best match. 

If the card you collected forms a yaku, you are asked if you wish
to continue with the hand. If you say no, then the hand ends and
you get the points for the yaku. If you say yes, you are calling
Koi-Koi, which means you can continue the same hand to get more
points. But if you continue, the computer player could possibly
score points next. Then you would not get any points for that
hand.  

Each suit has a combination of ordinary and special cards.
Special cards include various ribbons, animals, and lights.

The list of yakus:

Cards.
Get 10 plain ordinary cards for 1 point. 
The special poetry sakecup card can also be counted.
(and another point added for each ordinary card over 10).

Ribbons.
Get 5 ribbons (of any kind) for 1 point.
(and another point added for each ribbon card over 5).

Red ribbons.
Get all 3 red poetry ribbons (with writing) for 6 points.

Blue ribbons.
Get all 3 blue ribbons for 6 points.

Animals.
Get 5 animals (of any kind) for 1 point.
The animals yaku includes the iris bridge and the poetry sakecup. 
(and another point added for each animal card over 5).

Boar, deer & butterfly.
Get the boar, deer and butterfly animal combo for 5 points.

Moon meets sakecup.
Get the full moon light card, and the poetry sakecup combo
for 3 points.

Flower meets sakecup.
Get the cherry blossom light card, and the poetry sakecup combo
for 3 points.

Three lights.
Get 3 light cards (without the rain man card) for 6 points.

Rain four lights.
Get 4 light cards (including the rain man card) for 8 points.

Four lights.
Get 4 light cards (without the rain man card) for 10 points.

Five lights.
Get all 5 light cards for 15 points.

The dealer (oya) plays first. So if you are the dealer, then you
get the first shot at the cards on the table. If the hand is played
through and no yaku points are scored, then whoever is the dealer
wins 6 points.

In a real game, a Koi-Koi match is sometimes played for 12 hands,
or sometimes people agree on a winning score. There does not seem
to be a way to reset the score on the computer game. So if you
wish to start again, just delete or edit the (hidden) game.ini
file.

To toggle fullscreen mode use the alt-enter key combo.
To exit the game use the escape key.

Check out Hanafuda and Koi-Koi in the Wikipedia, to read about the
history of Hanafuda and get more details about the game.