First click anywhere on the center board randomize the coloured telephones.
Your task is to connect the phone with the same colour.
To achieve this, you have to drop rungs (vertical cables) between the horizontal cables. (Click an existing rung to delete it).

Here is how you find the phone connections work: Starting with a phone at the left border, go right along the straight until the next intersection with a vertical rung. Follow this rung up or down to the next horizontal bar, then go to the right again to the next intersection and so on.

After having dropped a few rungs, click a phone on the left to test a connection. The system will follow the cabling to the right and highlight its findings. If the connection ends at a phone with the same colour, the phone will ring and a yellow light will appear next to the telephone at the left border.
Adding or deleting a rung will cause all lights to go out again.
Click the same left phone again to switch off the red highlighted cabling.

Beginners: You win when you have managed to switch on all lights.
Experts: Use as few rungs as possible to solve the puzzle. The number of rungs used is displayed on the top border.

Variant 2 has ten telephones on each side.
There are also a five variants with fixed phone setups and a given number of rungs.

Background design: Fractal R000104c by Karl Scherer.

Compare game 'Telephone II' for a similar use of the 'ladders-and-rungs system'.

More freeware and real puzzles and games at my homepage: karl.kiwi.gen.nz.