Currently small craft use the river and lakes, but only one lock is operational.

After sunset, all crafts must use proper running lights.

All craft using the river Thames must be licensed.

Offensive weapons are also available; craft can use rockets, missiles and mines to disable competitors.

The crafts all use the same hierarchy.

A craft may use a barrel roll to remove any attached magnets.

The ship begins each round with a limited supply of fuel (40 points) which is consumed as the player uses thrusters to pilot the craft.

Assuming, of course, that the craft these so-called aliens used leaves a burn-off.

The craft used Nickel-cadmium batteries for power during solar eclipses.

Next, small craft using sonar creep into the area.