new Room(
    name = 'center room',
    description = 'empty square room. Each of the four walls has a door.'
    items = [
        new Item(
            name = 'box',
            description = 'plain wooden box with a lid',
            canBePickedUp = false,
            isContainer = true,
            isClosed = true,
            items = [
                new Item(
                    name = 'metal key',
                    description = 'small metal key',
                    unlocks = 'north door'),
            ]),
    ],
    exits = [
        new Exit(
            name = 'north door',
            description = 'the door leads to another room steeped in darkness'
            isLocked = true,
            destination = 'dark room'),
    ]);