Riddles (Where is the prisoner?)

Few of us care about the agility of our minds while we’re still young. However, this carelessness can lead to serious memory problems in old age. Solving different kinds of logic puzzles is the best way to keep your brain active and sharp. Even if you graduated a long time ago, it doesn't mean you should stop challenging yourself. These cunning brain teasers will help evaluate your logical reasoning. They definitely will make you scratch your head!