The Earth War MOD is a free add-on for the award winning game Half-Life.
The story behind it is too long to go into here, but there are links
to it from here.
The MOD is both single and multiplayer, with the multiplayer portion
being released first.
The single player part will be the story of the war on Earth, played
out by the key player, Nathan Bright. There will be new monsters,
allies and maps; and you will have a variety of weapons and abilities
under your control. Among these abilities are those of flight, concealment
and shielding. However, you must earn these abilities with experience
gained from killing monsters, or solving puzzles.
The multi player portion will have several modes of play. The first
one to be released will be the round-based teamplay game. Each team
must kill the other in order to win. You earn experience for killing
your opponents, through which you can become an awakened human and
have access to psychic abilities; but they get money in compensation.
To put it in one way, if you've just become an awakened human who
can fly and has the most powerful shield available, someone on the
other team probably has enough money to buy a homing low-yield tactical
The next mode of play to be released will be the cooperative team
play. During the game you must complete several objectives, be they
find out some information, bust out someone from an enemy encapment,
kill all the enemies, or assasinate just one... it all depends on
the mission. Each mission may also twist away from what you originally
thought... a simple ambush could turn into a mission where the entire
future of the human race is at stake.