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 Soldiers, 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

The Shotgun is effective at close to medium range, but 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. The Shotgun is the most reliable choice for fighting independently from your Sentry Gun or team - your other primary weapons sacrifice the Shotgun's consistency for situational damage or utility.

Frontier Justice + reskins

The Frontier Justice gains Revenge Crits for any kills or assists your Sentry Gun gets, but only after the Sentry Gun is destroyed. Try placing 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. Use Revenge Crits to push the enemy team back, rather than store them up - the Frontier Justice has a 50% reduced clip size, which limits you rampaging, and you lose all crits on death. The Frontier Justice can work even when both teams are equally matched, but less so when your team is disadvantaged.

Widowmaker

The Widowmaker consumes 30 metal per shot, refunds metal based on damage dealt, and deals increased damage to enemies targeted by your Sentry Gun. When using the Widowmaker, fight near your buildings and aim each shot - an accurate close range shot will yield more than the 30 metal it costs. The Widowmaker can be used alongside the standard Sentry Gun to take out attacking enemies faster, or alongside the Combat Mini-Sentry Gun for powerful dueling. Just in case you run out of metal, know where your Dispenser and metal pickups are, and carry the Pistol for backup.

Pomson 6000

The Pomson 6000 is less effective in direct combat than the Shotgun; 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 in its utility; an enemy Medic or Spy shot by it will lose a small portion of his ÜberCharge or Cloak meter, respectively. This is particularly useful when dealing with the standard invincibility-granting ÜberCharge or Spies using the Dead Ringer. The amount of charge lost depends on the distance, with none lost at longer ranges; you'll only be able to prevent their abilities from activating if you take some risks.

Rescue Ranger

The Rescue Ranger grants you the ability to haul buildings from a distance at the expensive cost of 100 metal. Hauling requires a direct line of sight, shows a visible tracer, and marks you for death; you can safely move buildings across open areas, but are discouraged from sneaking into the enemy base. Use this ability to save your Sentry Gun, especially if you see enemy Stickybombs or an ÜberCharge. Additionally, the Rescue Ranger fires weak bolts that repair buildings for 4 health per 1 metal. Don't use this to stay away from battle; the Wrench still repairs faster and the bolts do not remove Sappers. Overall, the Rescue Ranger is an excellent weapon if you prefer to rely on your Sentry Gun for firepower. Its mobility pairs well with the Jag, which aids in redeploying hauled buildings.

Panic Attack

The Panic Attack deploys 50% faster than the Shotgun, making it useful for a few panicked shots against a surprise attacker. However, the pellet spread widely increases as you fire consecutively, making it far less effective in prolonged combat. Unlike with the other classes, the Panic Attack replaces your primary weapon. If using it, keep your Pistol handy, avoid the main melee, and switch weapons when needed.

Secondary weapons

Pistol + reskins

The Pistol is an effective backup weapon at medium range, especially if you choose any primary weapon other than the Shotgun. You have a tremendous supply of Pistol bullets, so feel free to spam them to fend off enemies or check for Spies.

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 turns quickly, but you must do all the aiming. Use the Wrangler to attack enemies outside your Sentry Gun's normal range, siege an area, or destroy Stickybombs. Although the Wrangler grants your Sentry Gun protection, you will usually need to expose yourself to aim; like when using other weapons, 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 weak, short-ranged burst of electricity that costs 5 metal. The weapon's selling point is its secondary fire, a ball of electricity that destroys projectiles and reveals Cloaked Spies, which costs 65 metal. Stay close to your Dispenser to keep stocked on metal. Use the Short Circuit to defend your buildings from rockets, grenades, and even Stickybomb carpets, as well as track down Spies. 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 attacking enemies 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; compared to other primaries, 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. The Gunslinger can deal a guaranteed Critical hit upon landing three successful consecutive punches, but using a loaded Shotgun at close range is less risky.

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 makes escaping from the Pyro more difficult.

Jag

Hitting buildings with the Jag, which has increased construction and swing speed, causes them to build even faster than when using the Wrench. This makes the Jag effective for immediately constructing a Sentry Gun or redeploying 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 focuses on teleporting. It reduces the cost of constructing and upgrading Teleporters, and allows you to use the reload button to teleport to your spawn room and Teleporter Exit. Use nearby ammo pickups to make your Level 1 buildings, then teleport to base to quickly restock. The teleport itself is useful for defending your buildings if they're under attack, or retreating if you're in danger. Although you cannot teleport while hauling a building, you can sneak a Teleporter Exit behind enemy lines to build a nest in their territory. Overall, the Eureka Effect makes it easier to construct an initial base but weakens your in-battle repairs - hitting buildings does not speed up construction as quickly and all metal gained from pickups is reduced by 20%.

Buildings

You are most valued for your Buildings, which all considerably impact a battle. It takes time to fully set up a base, which means you need to choose certain buildings to prioritize. The Sentry Gun provides most of your firepower, so fully upgrade it first in most situations. If your teammates can hold the line without the aid of your Sentry Gun, upgrade your Dispenser or Teleporter system first. Additionally, spread your buildings out so that not all of them can be damaged by a single explosive from the Soldier or Demoman. 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. Consider the power of your Sentry Gun and what it can comfortably fight, depending on where you placed it. If a Sentry Gun is placed out in the open, it covers more ground but is more vulnerable to attackers. If placed in a corner, it is protected from flanking by walls, but only focuses on certain angles. 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, as a Dispenser has the potential to dispense unlimited health and ammo. 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

Depending on the map, the Teleporter might be your most powerful building. Your Teleporter system lets reinforcements skip an excruciatingly long walk so your team can build up a large enough push, especially when attacking the last point on Attack/Defend or Payload, or defend against unrelenting pressure. The Teleporter system is also effective for shepherding your team towards your buildings or alternate routes. Always keep a Teleporter system active, even if the distance covered is short.

The Teleporter system has a few important mechanics. The Entrance and Exit are linked - they share repairs and upgrades via your Wrench, and downgrade via destruction. As you leave spawn, drop a Teleporter Entrance so it will build itself and link to your Exit later. Place the Teleporter Exit behind cover and rotate it to face away from walls so teammates can see the battlefield immediately upon coming through. 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 you are guarding your buildings, refrain from standing on your Teleporter Exit, as enemy Spies can come through and telefrag you.