## Description
_Martians_ is an action game with some similarities to Avalanche and Kaboom!.
The player has to prevent aliens from landing and this is done by moving a
force field left and right across the screen. There are three kinds of
martians: invaders, destroyers and impostors. Invaders are stopped by catching
them with the force field while destroyers has to be allowed to land or else
they will destroy the force field and thereby end the game. Impostors are
invaders but change into destroyers on their way down. The game is over when
landed martians create a column of six aliens. For each invader caught with
the force field the player earns fifty points. When reaching a score of 10000
(and for every 5000 points after that) the player gets access to a bomb which
can be used to destroy some of the martians. Before a game the player can
choose a difficulty level from one to six.
Martians