2.4.3 As a user, I want to be able to acquire new skins when my score increases so that I feel rewarded.

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Tasks

• 2.4.3.1 Add a view for unlocking various skins.
• 2.4.3.2 Add an entity to Core Data to keep track of the user’s available coins.
• 2.4.3.3 Reward the user with coins when completing a level.

Acceptance criteria

• Display the user's current amount of coins.
• Display the costs of locked skins.
• Provide an option for buying a locked skin, which subtracts from the user's amount of coins.
• Reward the user only once for each star acquired in a level.