Object: Create one continuous subway loop.
 
You are the civil engineer in a big city. Your task is to build one continuous subway loop, thereby incorporating several existing tunnel sections.
 
First click anywhere on the center board. Several sections of a subway system will appear, coloured red.
 
Try to make it one big loop by adding bends, double bends, straights and crossings. The less additional parts of subway you need to accomplish your task the better.
 
Click a position several times. The system will cycle you through all available shapes of track sections.
One of the choices offered will be an empty position. This way you can delete a section.
The given red sections of the subway cannot be deleted, however. But you can click a red straight section to turn it into a cross, for example.
 
Click on the border to check whether indeed you created a single loop. You win when all sections are part of one big loop, otherwise you lose.
 
The other variants have a bigger board and/or more given sections.
 
 
Background design: Fractal Mo99121j by Morgan Owens and Karl Scherer.
 
More freeware as well as real puzzles and games at my homepage http://karl.kiwi.gen.nz.