Light hearted adventures.
You're going to buy a conceal gift that may contain something you like, think it's ok or dislike. You do however got a decypher code sheet that list out what the gift inside is due to the code imprinted on the packaging.
Take the suprise or spoil yourself by using the code?
(All the packaging are the same shape and size and the total possiblity of the gift amounts is reasonable amount so that you don't take long nor too quick figuring out that it contain).