Algodoo

A simple example of hydraulics, using circles instead of water, mostly to cut down on lag, but also because circles require less compression mechanics (which also cause a lot of lag from what I've seen).

Controls:

Up Arrow Key - hydraulic density goes up
Down Arrow Key - hydraulic density goes down

P.S.: The sim.frequency should be 500 when you start the scene, but if it's not, tap F10 and type in "Sim.Frequency = 500", without quotation marks.

If you don't know what the sim frequency is, open the console with F10, and type in "Sim.Frequency" without quotation marks. It'll tell you what the sim frequency value is. (should be 100 or 500. 100 is default)