This is a basic simulation of fluid physics (in 2D).
Instructions:
1. Click the Green Flag.
2. Move your mouse to move the circle cursor.
3. Touch the water particles with the circle cursor to activate the water physics.
4. Press Space to change to Keyboard Mode.
--Press Space to change back to Mouse Mode.
5. Use the arrow keys in Keyboard Mode.
6. Press R to reset the water particles.
Enjoy! :)