As the consummate host, you should never turn away an uninvited house guest. But in the event of a guest who makes it their mission to raid your spirit cupboard, we would like to issue you with some standard equipment: the Don't Break the Bottle puzzle.

Place your bottle of spirit in the puzzle and lock it up, paying strict attention to the instructions it comes with. The bottle will then be imprisoned in a seemingly impenetrable fortress. Only you will know how to unlock the puzzle and release the bottle.

Should your drinks cupboard be probed, your last bottle of spirit will remain safe and sound, whilst your thirsty visitor fumes over how to untangle the mess of balls and blocks. If all goes according to plan, they will give up after approximately ten minutes and return home.