dsl.rb

room ('coconut room') do
  description 'This room has a massive amount of coconuts'
  door do
    to 'banjo room'
    on_open do 
      # some stuff
    end
    locked true
  end
end

item ('coconut smasher') do
  description 'a very large hammer'
  usable_in 'coconut room'
  on_use do
    unlock 'banjo room'
    inventory.remove('coconut smasher', message => 'damn, you broke the smasher')
  end
end