For people who enjoyed Team Fortress Classic and maybe even still play it, there is a new multi-player modification out for Half Life 2 called Fortress Forever which brings the original game to the new Half-Life 2 engine which is powered by the Source engine. It needs to be noted that this is not a straight port of Team Fortress Classic, but an improved version that sticks to the original.
Fortress Forever was started as a way to bring the fast paced action featured in the original Team Fortress together with a few new things and give it a modern look.
Fortress Forever is different from Team Fortress 2 which has been developed by Valve Software. The game is offered as an install package for PC. To install it simply run the executable after you have downloaded the full installer from one of the official download servers. If you have played Team Fortress 2 and made the decision to try out Fortress Forever, you will notice that there are quite a few differences between the two games.
Among the differences are support for grenades, that critical hits are completely disabled, that players carry around backpacks with ammo that they drop when they die, that bunny hopping is enabled, that you can share ammo with other players, and that most classes have a crowbar as a melee weapon.
You can check out the TF2 Player's Guide to FF for a detailed listing of all the differences. Note that there is a tenth class in the game, the Civilian, that is not playable in Team Fortress 2.
The Wiki is an excellent starting point. It offers an introduction to the game, information about each of the classes and maps, advanced game play tips, modding information and more.
Update: Fortress Forever is still in active development and while updates have been few in recent years, they are still released fairly regularly to introduce bug fixes, modifications and new features to the game.
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