Gravity Master
The idea is simple. Move through the levels by making a ball touch a target. The problem: gravity will have its known effect on the ball, and the player must figure out how to make the ball move to the target. Clicking and dragging will create simple object (such as a line to bridge a gap) that can be used to help move your ball or create a necessary path.
Fantastic Contraption
Fantastic Contraption is a lot like Gravity Master in that you must move an object to a target. The difference here is that you have some building tools to work with. As you move through different problems, the contraptions that you build become more complex. There is a gallery online that lets you see some of the amazing contraptions that people have designed to accomplish the task.
Paintball The Game
This game is simple at first, but gets harder. You have to draw a path for the bouncing ball to follow in order to reach a target.
Super Stacker
This is a lot like when you were a kid learning about balance except these blocks don't make a mess when they fall down.
Super Stacker 2
An upgrade of the above game.
Totem Destroyer
This is a physics-based game in which you have to destroy a given number of blocks that are stacked. The hard part is that you can't let the balanced totem hit the ground. Great for critical thinking and hypothesis building.
Sola Rola Gravity Maze
This is a twist on the traditional maze. There are two balls (who frequently talk to each other) that you have to navigate to two separate targets. The balls react to gravity, so you have to use the arrow keys to turn the maze.
Electric Box
Connect a power supply to a target using objects from your inventory. For example, use a light bulb and a solar cell to complete a circuit.
Fastone Pyramid
A stacking game with angular boulders instead of flat surfaces.
Monkey Go Happy
A series of problem solving puzzles. Solve the puzzle using the manipulatives and make the sad monkey happy.
Riddle School 3
This one is a classic. Try to figure out how to get out of school by solving problems. You are timed...
Mushroom Guide
Similar to Paintball The Game but you have to figure out how to get a mushroom to land in a bucket.
Starfire Puzzler
Simple concept. Fire an arrow into a star to move to the next level. The problem is that all kinds of objects will get in your way and you need to use certain tools to clear them.
Rlax
Click certain shapes in order to clear the level. Good for spacial and shape recognition.