Those things are far from being mere riddles and puzzles.
These are, in a technical sense, a puzzle type; another name for them is "brain riddle."
You won't have any easy ideas for solving these brain puzzles; solving them will call for creative, introspective thinking.
You just have eight seconds to complete this brain challenge, so you'd better get moving.
A man lies on a hospital bed with two ladies encircling him in this brain teaser problem.
A few days ago, the man was involved in an accident and slipped into a coma.
Everything he knew, including his wife, faded from his memory after the disaster.