Light switch with 3 SPDT switches?

Question

In the below circuit, I have two switches that can turn the light on or off from those two locations. Any 'switch' will turn the lights into the opposite position:

How could a circuit be made to control light from 3 or 4 locations instead of just two?

Answer 1

Just use any number of DPDT switches in between : )

For example, with three switches like

^{simulate this circuit – Schematic created using CircuitLab}

and four switches like

^{simulate this circuit}

And so forth and so forth! Here's an example for five switches:

^{simulate this circuit}