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Buy a BFG
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How to play
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Unzip buy.zip to a subdirectory of your Quake 3 folder.  I recommend "<path to q3>/bfg".
At the command line, run:
quake3.exe +set fs_game bfg

The basic gameplay is still the same... run around and try to kill people before they kill you.  However, a new command has been added to allow you to spend several frags to buy a BFG.  To use this option, bind a key to "buy" at the console, i.e. "\bind b buy".


New CVars
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These can be set by the server from the console at any time.  A file, default.cfg, is included to return the values to the original settings.  If you wish to use the defaults again, just type "\exec default.cfg" at the console.  To change the individual variables, type \<variable name> <new value> at the console, i.e. "\g_BFGCost 2".

g_BFGCost
The number of frags required to buy a BFG and the initial ammo. Set to 3 as a default.  Cannot be negative, and probably shouldn't be 0.

g_BFGAmmo
The initial ammunition given when you purchase the BFG.  The default value is 30, can't be negative.

g_BFGCost2
The frags required to buy more ammunition for the BFG when the player is already holding one.  Default value is 3, will default to this if negative.

g_BFGAmmo
The amount of ammo added to a player when they already have the BFG.  The default value is 45, and again cannot be negative.


Known bugs
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I haven't taught the bots how to play yet.
It doesn't display the cost of the BFG or the ammo used.


Where to find it
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http://www.planetquake.com/warbird