Basic Engineer strategy

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The Engineer has the unique ability to construct Buildings. His Sentry Gun compensates for his weaker weapons and fragility, providing more than enough firepower at the front lines in his stead. His Teleporter system transports teammates around the map, while his Dispenser heals and supplies ammunition. After constructing a building, he can pick up and haul it to a new location, allowing him to keep his base as his team advances or retreats. The Engineer and his buildings will frequently be targeted by Demomen and Spies. A well-timed enemy ÜberCharge, in particular, can quickly ruin all of his hard work. When his buildings are destroyed, it is most important that the Engineer makes it out alive so that he can reconstruct his base. A good Engineer will place his buildings in strategic locations and not be afraid to get his hands dirty defending them.

Primary weapons

Shotgun + reskins

Out of your available primary weapons, the Shotgun is your most reliable and deals the best consistent damage. It is a deceptively powerful weapon at close to medium range, but becomes much weaker at a distance. Use it to defend yourself when alone and scare off enemies that your Sentry Gun cannot target, such as disguised Spies.

Frontier Justice + reskins

The Frontier Justice has half the clip size of the Shotgun, but gains Revenge Crits for any kills or assists your Sentry Gun gets. This weapon shines if you place your Sentry Gun or Combat Mini-Sentry Gun in an offensive position, where it should be able to get a few kills or assists before being destroyed. Even if you have stored up a great number of Revenge crits, the small magazine size in addition to the threat of losing all of them upon death will prevent you from going on a mini-rampage. It is possible to destroy your own Sentry Gun to store accumulated crits, and then build another Sentry Gun. However, destroying your Sentry Gun at the wrong time may force your team to give up the area you were overseeing.

Widowmaker

The Widowmaker consumes 30 metal per shot, but will refund metal based on how much damage you deal. Accurate shots at close range will usually yield far more than 30 metal. Medium to long range shots will generally yield close to or below 30 metal. With good accuracy, you can provide great support in direct combat, especially if you also use the Gunslinger. On the flip side, missing too often will cause you to run out of metal and be unable to defend yourself. The Widowmaker is best used when defending your buildings, as your Dispenser can replace most of the metal you lose from firing at a distance. Equip the Pistol alongside the Widowmaker so that you have a reliable ranged attack even when out of metal.

Pomson 6000

When compared to the Shotgun, the Pomson 6000 is less effective in direct combat; it deals reduced damage, has a smaller magazine size, and its projectiles are significantly slower. However, it is accurate and reloads quickly, so you can use it to freely harass faraway enemies such as Snipers. The Pomson 6000's true value lies within its utility; a Medic or Spy shot by it will lose a small portion of his ÜberCharge or Cloak meter, respectively. This can be used to prevent them from attacking or escaping your team, particularly when dealing with the standard invincibility-granting ÜberCharge or Spies using the Dead Ringer. The amount of charge lost is on distance, with none lost at longer ranges; you'll only be able to prevent their abilities from activating if you yourself take some risks. Consider using the hitscan Pistol alongside it so that you have a more reliable weapon for self-defense.

Rescue Ranger

The Rescue Ranger grants you the ability to haul buildings from a distance at the expensive cost of 100 metal. If your buildings are under attack, prioritize saving your Sentry Gun, especially if you see enemy Stickybombs or an ÜberCharge. Long range hauling requires a direct line of sight and shows a visible tracer. You can safely move buildings across open areas and save them from being destroyed, but can't sneak them into the enemy base. Hauling a building will mark you for death, encouraging you to only use the hauling mechanic when out of combat. The Rescue Ranger fires weak bolts that can repair friendly buildings from a distance, allowing you to remain in a safe area and save metal for an emergency long range hauling. This is balanced by your capabilities at close range, where the Wrench repairs faster and hauling is free. The bolts do not remove Sappers, making them as vulnerable to Spies as ever. Overall, the Rescue Ranger is an excellent weapon if you rarely use the Shotgun and prefer to rely on your Sentry Gun for fire power. Its mobility pairs well with the Jag, which aids in redeploying hauled buildings.

Panic Attack

The Panic Attack allows the user to load up to four shots, then fire them consecutively. Unlike the other classes with access to it, the Panic Attack replaces your primary weapon instead of the secondary one. Having to load bullets before firing can make yourself predictable in a direct fight, forcing you to rely on your Pistol or Sentry Gun for self-defense. On the other hand, many of the beefier classes assume that a lone Engineer is an easy kill. The Panic Attack's firing rate and bullet spread increase as your health gets lower; you can load the weapon while an enemy pursues you, then turn around and burst them down.

Secondary weapons

Pistol + reskins

As an Engineer, you have a tremendous supply of Pistol bullets, so feel free to spam them to fend off enemies or check for Spies. It is deceptively effective at medium range, making it combo well with Combat Mini-Sentry Guns.

Wrangler + reskins

When the Wrangler is your active weapon, your Sentry Gun gains a damage-reducing shield and can be aimed manually. While the Sentry Gun is under your control, it fires more rapidly and isn't restricted by its slow turn speed. However, it will not automatically detect targets, forcing you to do all the aiming. Manual control is usually used to attack enemies outside your Sentry Gun's normal range or to siege the enemy base. You'll usually need to expose yourself to aim the Wrangler via your crosshair; like when using another weapon, duck in and out of cover to avoid being picked off. Deactivating the Wrangler will disable your Sentry Gun for 3 seconds, so you need to balance its activation with building repairs. If you need to focus on something else, don't be afraid to allow your Sentry Gun to function normally.

Short Circuit

The Short Circuit's primary fire is a very short-ranged burst of electricity that deals damage equivalent to a Pistol bullet and draws from your metal supply, an overall downgrade. The weapon's selling point is its secondary fire, which unleashes a slower, wider arc of electricity that costs 15 metal and destroys enemy projectiles. It's particularly useful for defending from rockets, grenades, and even Stickybomb carpets. You can't pick up buildings while the Short Circuit is your active weapon; this means that your team needs to quickly take out the enemies firing projectiles before you no longer have metal to fire the Short Circuit in defense.

Melee weapons

Wrench + reskins

The Wrench is not just a weapon; hitting buildings with your Wrench will cause them to build twice as fast. Hitting a pre-constructed building you hauled speeds up reconstruction, so it's possible to build and upgrade while at spawn before hauling your buildings into position. If a Spy places a Sapper to disable a building, two hits from your Wrench will remove it. Disabled Sentry Guns take 0.5 second to reactivate after having a Sapper removed, so first take care of the Spy if he hangs around. The game prioritizes repairing and upgrading buildings over melee combat, making it possible to accidentally hit your buildings instead of an enemy; use your Shotgun to dispatch nearby enemies instead.

Gunslinger

The Gunslinger grants you 25 additional health points and replaces your Sentry Gun with a cheap, rapidly constructed, but weaker Combat Mini-Sentry Gun. The Gunslinger is great when constructing a full Sentry Gun can be inefficient, such as when you're on the offensive, in the middle of combat, or moving around too often. If you're staying at medium range, support your Mini-Sentry Gun with the Pistol or Wrangler. For a more aggressive playstyle, use the Shotgun or Widowmaker; the Shotgun needs to be reloaded less frequently while a few well-aimed shots with the Widowmaker will give you enough metal to build another Mini-Sentry. While the Gunslinger can deal a guaranteed Critical hit upon landing three successful consecutive attacks, using a loaded Shotgun is less risky and deals more damage-per-second at point-blank range.

Southern Hospitality

The Southern Hospitality grants a bleed effect on hit, but deals no critical hits and increases your vulnerability to fire. The bleed effect inflicted can be useful in a one-on-one fight and helps to track down Cloaked Spies. The fire vulnerability is negligible; if a Pyro manages to catch you alone and away from your buildings, you're probably going to die anyway.

Jag

Hitting buildings with the Jag, which has increased construction and swing speed, causes them to build even faster than when using the standard Wrench. This makes the Jag more effective for immediately constructing a Sentry Gun or redeploying a nest of buildings as your team moves around. However, the Jag has a reduced repair rate, deals less damage, and takes three hits to destroy Sappers, making defense against a constant assault or Spies much more difficult.

Eureka Effect

The Eureka Effect allows you to use the reload button to teleport back to your current spawn room or Teleporter Exit. Resupply Lockers can be accessed immediately after returning to base, allowing you to restore resources. However, this comes at the cost of slower construction when hitting new buildings with your weapon. This also reduces the amount of metal you gain from pickups and Dispensers by 50%, making it difficult to construct and repair buildings when away from spawn. It's best to use nearby ammo pickups to initially construct your buildings, then use the Eureka Effect's teleports to quickly upgrade them. Although you cannot teleport while hauling a building, you can sneak a Teleporter Exit behind enemy lines, then teleport to-and-fro to build a nest in enemy territory. You can switch wrenches and not lose pre-constructed buildings (except for losing the sentry when switching from wrenches with different sentry types); use this to negate the negative effects of the Eureka Effect. You can use the Eureka Effect's teleport either to quickly return to battle to save your buildings, or to quickly retreat from battles to prevent death.

Buildings

You are most valued for your Buildings, which all have a sizable impact in a battle. It takes time to fully set up a base, which means you need to choose how to spend your time accordingly. Because the Sentry Gun provides most of your firepower, you'll want to fully upgrade it first in most situations. If your teammates can hold the line without the aid of your Sentry Gun, consider upgrading your Dispenser or Teleporter system first to further aid them. If any building is in danger of being destroyed, you can haul it away; it's sometimes more important to save an upgraded Sentry Gun than to stall your enemies.

Sentry Gun

The Sentry Gun automatically detects and fires at enemies within its radius, making you the best class for area denial. It's best to place Sentry Guns in well-frequented areas to prevent enemies from passing, hauling and repositioning it as needed to support your team. As soon as possible, secure a stable source of metal from either a Dispenser or ammo spawn to upgrade your Sentry Gun and improve its firepower. Keep in mind the power of your Sentry Gun and what it can comfortably fight, considering where you placed it. If a Sentry Gun is placed out in the open, it can cover more ground but will be left more vulnerable to attackers. If placed in a corner, it is naturally protected from flanking by walls, but can only focus on a certain angle of the battlefield. Precise placement of your Sentry Gun can be very rewarding; a few inches can keep it from being picked off by Soldiers or Snipers. Compensate for what the Sentry cannot detect with your Shotgun, especially enemy Spies.

Combat Mini-Sentry Gun

Due to their small size and quick build time, Mini-Sentry Guns can often be placed in positions that a normal Sentry Gun cannot and perform exceptionally well when laid in concealed areas. These advantages, coupled with the bonus health the Gunslinger provides, allow for more aggression compared to the defensive playstyle of the default Sentry Gun. Place them alongside teammates at the front lines, forcing your opponents to choose between targets. They only cost 100 metal to deploy, so you should be able to provide a constant source of suppressive gunfire. Mini-Sentry Guns have reduced health and deploy significantly slower until constructed, requiring you to stay put and speed up the construction yourself if you want them to be anything beyond a minor distraction. They are far less useful when placed in defensive positions, where their reduced firepower won't be able to fight enemies off efficiently.

Dispenser

A Dispenser is typically the first building you want to construct so that you have a stable source of metal. It takes a very long time for a Dispenser to build, even with the help of your Wrench, so consider placing it in a safe location to let it build by itself while you focus on setting up your other buildings. Placing Dispensers in forward locations will keep teammates healthy and allow them to hold an area for a longer period of time. Additionally, because the Dispenser is a solid object, you can hop on your own Dispenser to climb to inaccessible places or block narrow passages from enemy Spies.

Teleporter

The Teleporter Entrance and Exit are constructed separately, but upgrade via your Wrench and downgrade via destruction together. Keep a Teleporter system active to help a steady tide of reinforcements reach the front lines, even if the distance covered is short. As you leave spawn, drop a Teleporter Entrance so it will build itself and link to your Exit later. Place the Teleporter Exit near your other buildings, where it will be well defended, or behind cover, as a visible Teleporter will draw attention. Rotate the Exit using alternate fire so that it faces away from a wall and allows teammates to see the battlefield immediately upon coming through. If either Teleporter member comes under fire, hitting one end with your melee weapon will repair the other. Try to keep the Teleporter System at least at level 2, as level 1 Teleporters usually have too long of a recharge to be worth the wait. If guarding your buildings, refrain from standing on your Teleporter Exit, as enemy Spies are able to come through and telefrag you.