Various modules

Structure : Wall, Ground, Ramp, Ice, Glass, etc.
Free Fall : Stone ball, Basketball, Dice, Grenade, Compound cube, etc.
Machines : Car, Single Wheel, Claw, Conveyor, Door, Ejector, Elevator, etc.
Gravity : Modules that could change the direction/size of gravity.
Button : Some physics interactive buttons.
Keyboard/Mouse : Uses keyboard or mouse to click the buttons.
Calculate : Constant, Equal, Counter, Digit display, etc.
Others : Music note, Bomb, Accelerator, LED, Win trigger, etc.

Puzzle mode

Use specific modules to build, try to press the specific button to pass the level.
40 levels.

Free mode

Use all modules, unlimited, build scene you like.
Save / Load the scene you build.
Export the scene you build to a file, you could share it to your friend or others.