Lateral thinking experts, Sloan and MacHale, have created the biggest selection of thought-provoking puzzles under the sun - also some of the most difficult. These are no exception: each challenging mental teaser presents a mini-scenario with a secret twist that's truly tough to figure out. The only way to find the answers is to get rid of any preconceptions, use your wildest imagination and think way outside the box. Solving has never been such infuriating fun.