Dragon Solitaire

This is a recreation of the Solitaire minigame from SHENZHEN I/O, made using DragonRuby.

Rules:

• There are three types of cards: numbered cards, dragon cards, and the flower card. Numbered cards and dragon cards come in three suits, distinguished by color.
• You may move one or more numbered cards onto another numbered card in the lower decks, so long as the moved cards and the unmoved card satisfy the following rules:
  • A card cannot be stacked on a card of the same suit.
  • Cards must be stacked in consecutive decreasing order.
• Dragon cards may not be placed on any other card, and no cards may be placed on a dragon card.
• Any single card may be placed and retrieved from the three bank slots in the upper left.
• When four dragon cards of the same suit are exposed, a button will light up. If you press this button, the four dragon cards will be discarded, at the cost of one bank slot.
• Numbered cards will be automatically discarded to the three slots in the upper right when it is safe to do so, but you may manually discard a numbered card if you wish. 
• As soon as it is exposed, the flower card is discarded to the upper middle slot.

• A discard pile must only contain cards of a single suit, and must be in sequential ascending order.
• Discard all cards to win the game!

Controls:

• Mouse - Move cards
• Space - New game

Special thanks goes to the people in the DragonRuby Discord server for all their help!