If we say the Hamsterball is based on "speed + balance", and the Ballance (3D Balance Ball) bases on "balance + gravity", then this Puzzle Dimension is a rolling & jumping ball game in twisted 3D space based on the "puzzle + maze" elements.
Perfect Balance is series of extremely challenging and difficult physics and gravity based small balance game, with ingenious design. Your goal is to, in specific environments, through placing bricks in various shapes to achieve their overall balance.
At first glance, you may not believe that this series of small flash games turns out to be full 3D with only 500 KB size for its original .SWF file (designed by A Small Game). In particular, it comes with my favorite two elements: ball + balance with the effects of gravity and collision based on physics.
Universe Sandbox is a very cool software designed to simulate the physical interaction movements (you can create & destroy on an unimaginable scale) of universe stars perfectly. It has a 3D engine with very high simulation degree, and is a pretty darned good simulator (also can be regarded as a scientific game) for understanding the whole universe.
3 Slices is a simple but very challenging physics-based small puzzle game. In spite of the simple graphics, the game is well-designed and very addictive, which needs you have very high ability on logic analysis and judgment.
G-Switch is a very cool anti-gravity based small flash game with parkour style, very exciting, addictive and rare to find. It tests the player's reaction speed, and the way it defeats players is to use the inertia of human action and thinking.