Jam is a game invented by John A. Michon . It has nothing to do with the misnamed Traffic Jam puzzle.
You play against your computer. The board depicts a network of 9 roads and 8 cities. Players take turns selecting a road. The goal of the game is to take all the roads that pass through a city.
If the box "I move first" is checked, you have to click the "Start" button which will cause
the computer to make the first move. Computer selections appear in red, yours in blue.
Jam has a secret known to the computer and waiting to be discovered by you. It's pretty hard to beat anybody in the know. Computer, being one of the few privileged, makes, from time to time, benevolent mistakes. See if you can beat it.