FreeCell

I wanted the command-line version to feel as close to the real game as possible, so a few details mattered:

Features

• Move multiple cards between cascade piles in a single action
• Reject invalid moves with helpful warning messages
• Detect a finished game and congratulate the player
• Shuffle the deck at the start of every game
• Restart mid-game with a fresh deal

What I got out of it

• Applying Model-View-Controller to separate concerns cleanly
• Designing interfaces and classes that are easy to extend but resistant to change
• Thinking carefully about what should be public, private, or protected
• Building a text-driven input/output loop on the command line