```ruby
class Widelands < Cask
  url 'https://launchpad.net/widelands/build17/build-17/+download/widelands-build17-mac.dmg'
  homepage 'https://wl.widelands.org/'
  version 'Build 17'
  sha256 '3812ae9f95697269a94970fc83c2c16ab962f450b5a114057046fde3bcfc5a2c'
  link 'Widelands.app'
end
```

Update Widelands to Build 18
user
```ruby
class Widelands < Cask
  url 'https://launchpad.net/widelands/build18/build-18/+download/widelands-build18-mac.dmg'
  homepage 'https://wl.widelands.org/'
  version 'Build 18'
  sha256 '1d209dcf653942788120c6f1abbe6f421fdefe6776f4feed48c58eddeb4c3722'
  link 'Widelands.app'
end
```
assistant