“What has 88 keys riddle” is a simple riddle to answer. The riddle asks about a thing that has so many keys which are around 88 but still that keys cannot be used for opening a door.
Question: “What has 88 keys, but can’t open a single door what is that?”
Answer: A piano (keys).
A piano is a correct answer to the above-mentioned riddle. As we know that Piano has so many white and black keys but that key is used for playing music, not for opening doors.