Mind Candy

Mind Candy is one of the world's leading developers of
social multi-player games, helping kids (and big kids!)
around the world play and connect.
Its first game Perplex City required players to solve extremely challenging puzzles to locate a missing treasure.

Its latest game, Moshi Monsters, is aimed at young children and is growing very rapidly. These puzzles are at least mostly solvable by the average Venture Capitalist.