Puzzles are not closed problems; they can always be modified or improved to generate a myriad of variants. What's more, they don't require batteries; they are just powered by our own brain cells! To solve the perplexing and tricky puzzles you will find in our site, you need a very high IQ -- not the usual and controversial 'Intelligence Quotient', but the "Inveniens Quaerendo" (Latin, discovering by trying) ability. Intelligence is not what you FEEL or what you KNOW, but a PROBLEM SOLVING SKILL. You can acquire or develop problem-solving skills simply by training yourself at your own pace and relying on your existing knowledge. Remember: "intelligence begins with a piece of paper, a pencil and... a problem to solve!". The ancient Greeks used to say: Αρχη 'ημισυ παντοσ ("Archêhêmisy pantos", starting on a job is half the job done)... So now, try to solve some of our puzzles!