ThinkFun puzzles: River Crossing, Laser/Gravity Maze, Quadrillion etc

I have here a lot of 4 excellent ThinkFun (aka Binary Arts, the people who got famous with Rush Hour) puzzles, plus one more from the equally outstanding SmartGames company. All of these puzzles have multiple challenges (40 or more I think) that range from easy to very difficult. Puzzles include Gravity Ma...