```ruby
class MiniMetro < Cask
  url 'http://static.dinopoloclub.com/minimetro/builds/alpha9/MiniMetro-alpha9c-osx.zip'
  homepage 'http://dinopoloclub.com/minimetro/'
  version 'Alpha 9c'
  sha256 'ef7efc8fe17600d99531810c718be31e80f72076fa2223c5f23fce39a27ba00c'
  link 'MiniMetro-alpha9c-osx.app', :target => 'Mini Metro.app'
end
```

Update Mini Metro to Alpha 9d
user
```ruby
class MiniMetro < Cask
  url 'http://static.dinopoloclub.com/minimetro/builds/alpha9/MiniMetro-alpha9d-osx.zip'
  homepage 'http://dinopoloclub.com/minimetro/'
  version 'Alpha 9d'
  sha256 '6ab2aa60fe4d65f347b2277ebb6ddb3712ef1efa30c8489cc559e5d9f817881b'
  link 'MiniMetro-alpha9d-osx.app', :target => 'Mini Metro.app'
end
```
assistant