If you don't already know how to play Klunker, you can read the rules here, or you can ask someone online at Xantopia to teach you. Here are some instructions for using the interface:
1. The bottom portion of the game screen represents your "area". Your hand is in the white box to the left, your schaufenster area is in the center, and your vault area is below your schaufenster area.
2. During the schaufenster phase, drag cards from your hand and drop them into your schaufenster area. If you change your mind about a card, you can drag it back to your hand. Press the "done" button when you're done.
3. During the vault phase, drag a card from your hand and drop it in your vault, or drag the next number from above the Klunker logo and drop it beneath your schaufenster card.
4. During the buying phase, click on any card in the schaufenster you want to buy.
5. After the game ends, press "esc" to toggle back to the room screen. You may press the "Start Game" button to play again, or click on a room name to move to a different room.