Object: Cross the snakepit without getting bitten.
(5 randomized, 10 fixed variants).
 
First click the baord to create a random placement of snakes in a snakepit. Your man will appear at the lower left corner.
All the snakes move one square orthogonally, and so do you. To resolve conflicts, snakes with their heads further to the top and further to the left move first (i.e. 'text-reading' order).
 
The snakes move according to the following rules:

1. The head of a snake moves one square, and all other segments follow, occupying the square of their immediate predecessor.
2. There are black left-handed snakes and green right-handed snakes. This decides their preferred option when they turn.
3. In order of decreasing priority a snake's head will: (a) try to move forward to a vacant square. (b) turn 90 degrees in its preferred direction to a vacant square. (c) turn 90 degrees in the other direction to a vacant square.
4. A snake never moves its head to an occupied place (except when it bites the man). Rather it will stay still and wait for a legal move.