In
Team Fortress Classic, a first person shooter style, online, computer game, a
sentry gun is an automated
chaingun (and at it's highest
level an extra chaingun and
RPG). The
SG can only be
built by an
engineer, a play of that class has three levels of construction to this
weapon.
The first SG takes 5 seconds to
make and
cost 130
cells (or
metal units) to do so. It can not be built in certain
respawns,
special areas between
entities, or spaces that it could not physicaly fit into. This
cannon can
inflict 75 HP per second given the
target is within range. If
destroyed, it will deal 50 units of damage to
players near it.
The second level is much like the first, but it can
take 150
HP per second and 60 when destroyed. It cost an additional 130 cells, but needs a first level SG to make that addition to.
The third and highest level can do about 180 to 300 HP loss per second depending if it has
rockets or
shells. It also, on
destruction causes 200 units of damage. This level is extremely hard to
escape from. It's rockets and shells make running hard as they pound you.
All SGs make a
mechanical /
radar sound so you always know when to be on your toes, but if you hear a "woot woot" you are out of luck.
Spies can not be
detected while in
disguise and can drop a few
grenades to easily take them down. Demomen can destroy SGs around corners by using
pipe bombs or charging with a
MIRV grenade. At long
distance snipes and
soldiers can easily destroy SGs.
Scouts can sometimes run by a SG without being killed due to their extreme
speed, but only if they do it at a 90 degree angle of where the gun is aimed.