HomepageMartin LehmannPopular puzzles created by Martin Lehmann Popular puzzles created by Martin Lehmann Solve puzzlePanorama of Porto on river Duero (Portugal)117Martin Lehmann • solved 2,471 timesSolve puzzleDom Luís I Bridge in Porto (Portugal)66Martin Lehmann • solved 2,111 timesSolve puzzlePanorama of Porto (Portugal)140Martin Lehmann • solved 1,468 timesSolve puzzleUtrecht - the view from the Dom Tower (Netherlands)108Martin Lehmann • solved 968 times