A breakable toy to practice principles of OO Design as laid out in Practical Object Oriented Design by Sandi Metz.

• Move all the pieces from Tower 1 to Tower 3.
• You can only move one disc at a time.
• You can never put a big disc on top of a smaller one.

• When a player starts a new game, the player may choose the number of discs they would like to solve for.
• A player will be given the games rules on start.
• A player may see the game rules whenever they type the command.
• A player may restart or quit the game whenever they wish to.
• A player has solved the puzzle when Tower 3 holds the starting number of discs.
• A player will know how many moves they have used.
• A player will be told as soon as they have surpassed minimum moves to solve, so they may restart if they wish.
• A player will know how much time they are taking.
• A player will know as soon as they have solved the puzzle.
• A player will know if they solved the puzzle in the minimum amount of moves or higher or lower(!).

• The timer will continue to run as long as the player has not quit, restart, or solved the puzzle.
• The game will validate each placement of disc.
• The game will verify solved status when the third tower has a size equal to the starting discs.
  • Only required at this step because the placement logic will not allow for anything else

• towers
  • hold discs
• discs
  • has a size
• placing discs
• validating disc placement
• basic graphic representation of towers and discs
• check for solved status (placement checking algorithm)
• ability to restart or quit a game
• game loop that runs until, quit, restart, or solve

• counting moves
• timer
• variable tower sizes
• calculate minimum moves per tower size
• score player moves against minimum moves

• adding a disc to a tower registers as added
• removing a disc from a tower registers as removed
• only one disc may be moved at a time

• 1 disc may not be moved

• smaller discs can be placed atop larger discs
• larger discs cannot be placed atop smaller discs