• You can hold the Interact key to automatically do something when it's in range

This is useful for when you want to get down fast and have a zipline or pipe below you, you'll automatically start riding them and take no fall damage.

• Hold the Fire key to throw carried items further

Everything you can carry can be thrown, this makes traversal with heavy items often easier as you can throw them ahead of you, run up to it, and repeat. This is faster than just carrying it and it allows you to defend yourself in between throws.

• You don't have to deposit everything when escaping

Gold, crafting resources, everything in your pockets is counted, no need to risk going down.
If it's not related to the mission and it's not an object you carry, it's counted towards the end total, the only thing you don't get for things in your pocket is a negligible amount experience.

The side deposits are mainly for last-moment secondary objective completion and large objects like compressed gold and jadiz.

• You can set a waypoint for yourself

Pressing the Laser Pointer key + the Interact key sets a waypoint visible to only you, this can be seen through walls and on your terrain scanner, good for remembering where something is.

• Landing on a fellow dwarf negates all fall damage

If you see someone falling, try and catch them, or ask your teammates to stand below you for a safe landing if no better alternatives are available.

• You don't need to play the class that a promotion assignment is for

You can play a different class and earn experience for them too, your level 25 dwarf won't earn anything until you finish your promotion assignment.

• If you have two sentries, you can choose which one to move

As Engineer, press the Reload key with the sentry tool selected to switch between #1 and #2, the currently selected sentry will be highlighted on your UI.

• Driller's axes aren't consumed on breaking terrain

You can use them to destroy things like gas plants in the fungus bogs and pick them back up afterwards.

• They only heal if their health is too uneven

If you spread out your damage between both of them they'll probably never heal more than once, and if they do then it won't be by much, this will save you time and ammo.

• The damaged one heals far more than the healthier one loses

It's usually never worth it to just keep shooting only one, if one is too damaged you should stop shooting it and look for the other.
If you can't find it then it's not that bad of an idea to keep shooting just one of them.

• Their healing can give you an opening

If you need a moment to collect yourself or revive teammates, you can ignore all this force them to heal by focusing one twin.

They will run away when hit in the face with an explosive.
This makes them less of a threat and easier to kill

When a Korlok Sprout is on fire, it is unable to attack.

• Mini-Mule legs spawn a swarm of bugs

On extraction when entering a 2 meter radius around a broken mule for the first time, horde of bugs will spawn.

Each mini-mule has 4 legs tied to it, one leg will spawn horde, other 3 legs are safe, these hordes stack as many times as you dig up mule legs.

Scanning for them has no effect on bugs spawning, so feel free to scan for all of them.

• Hold the Interact key while riding a pipe

Holding this will make you come to a stop at the next point of interest, that being a build point or a break in the line, letting go of it early will make you jump off where you are.

• Doretta repair speed caps out at one dwarf

Unlike everything else, repairing the drilldozer doesn't get faster with more people doing it, this repair speed matches the speed at which Doretta can take damage, which is also capped.
If you see someone fixing the drill, or someone joins you in fixing it, start defending it instead.

• Do NOT stand on the drilldozer during phase 2

You take far more damage from boulders than Doretta does, you can repair Dotty from the ground if need be, there you won't take any damage from boulders.

• Blue lightning crystals can be easily broken

Instead of having terrain physics like other crystals, they're an entity which means they have health, but they still need ground to stand on, if you dig out the terrain under their base they'll instantly break.

• Red Moving Vines

Creeper Vines can be easily destroyed, one power attack will instantly destroy them, if you don't power attack them you can hit the base with your pickax until they break.
It's always worth it to destroy them in case you need to come back the way you came, then you don't have to deal with them a second time.

• Yellow Gas Plants

These can easily be destroyed by any means, they have a pretty small health bar.

• You don't need to interact with the map

You can instead just press your Terain Scanner key (default is Tab) and open it wherever you are

• You can prevent more than one class from joining missions

If you want to in the options menu under gameplay you can tick "Prevent Latejoin Character Duplication", this will prevent a class you already have in your game from being picked during a mission.