Controls:
WASD keys to move (W to move forward, S to move backward, D to move right, and A to move left respectively.)
Left Click to shoot/attack: Hold Left Click to fire at full auto when possible. It is also used to attack constantly while playing Runner.
Right Click to aim down sights: Note that you cannot aim down sights while using the Akimbo Uzi. Also note that when using the Runner class or a melee weapon, right clicking will bring up a bar in the middle of the screen which fills up; this is the damage/range meter. Right clicking and holding will fill up the bar. When left clicking while the charge bar is full, this will do the maximum damage to any player it is thrown at, also at the maximum distance the melee weapon can travel.
Pressing R or Left Click reloads your weapon.
Q key allows you to switch to your melee weapon, while E key allows you to switch to your secondary weapon. Scrolling down and up also does the same respectively.
Holding two movement keys at the same time allows you to "strafe" which is Krunker's form of sprinting. For example, you can strafe by holding WA or WD. Note that you cannot strafe if you are moving in two opposite directions (WS or AD). Strafing will cause you to walk and jump faster and move diagonally so it is a bit harder to control.
Your camera can be controlled with your mouse by pointing your crosshair in the direction you want to look in. You can also change direction by using your camera (e.g. looking to your right than pressing W to walk forward.)
Pressing the space key allows you to jump. Consecutively jumping (also known as bhopping) builds you up a lot of momentum, it is a good strategy to make use of this in normal gameplay and Parkour because it makes you hard to hit, and lets you jump farther with your momentum. Also classes like Runner, Agent and Run N Gun allow you to walljump by jumping in to a wall.
Pressing the shift key will cause you to crouch, which steadies your aim. While crouching your movement will be hindered and your jumps will be much shorter and lower. This is handy if you want to hide or make your hitbox smaller.
Update 1.1.0 introduced sliding, which is activated by pressing Shift (or any other button you may have assigned to crouching) right as you are about to land from a jump, and is faster than any other movement type in the game. Sliding lasts for about a second; you cannot slide backward, but you can turn while sliding, allowing experienced players to slide around corners to surprise any players waiting on the other side. Sliding can also be combined with bhopping, in what is known as slidehopping or bsliding; you have to jump, slide, and then jump again before the slide is fully over, then repeat.
Update 2.8.4 made slidehopping no longer FPS based, meaning anyone could slidehop, regardless the FPS of a player.
alt opens up the player list of the lobby. You can use the player list to call the K.P.D by pressing the blue icon, votekick a player, or alternative if you're the host of the game, ban and kick players.
F key lets you deploy a Spray. Holding F and using your scroll and scrolling up or down lets you select your desired spray. (Must have Premium)
X key allows you to "inspect" your weapon. Pressing X starts an animation which shows your character holding your weapon sideways. This is a relatively useless mechanic, it's mostly for admiring your new weapon skin, as you cannot shoot with the animation on but you can cancel it by pressing X or scoping. (Added in update 1.1.2) .
G key allows you to pick up weapons (where applicable). Note that you can only pick up weapons in maps where there are weapon pickup areas. If you already have a weapon, your current weapon will be swapped with the weapon you are picking up. Added in update 1.3.1
Z key allows you to drop your current held weapon if you acquired it from a weapon pickup.
Tab key (normally located above the caps lock key) allows you to view the scoreboard (if you don't have on the old scoreboard) in your game when pressed. In both public and custom matches this mechanic allows you to view the list of players. (Added in update 1.2.5).
Enter allows you to start typing in Chat (unless you turned it off in the Game Settings).
V enables voice chat which allows you to use your mic in-game.
Pressing Left Click in prop hunt allows you to change to the prop you clicked on. (This only works if you on the prop team)
Pressing F in spectate mode allows you to move around freely.
When playing in prop mode as prop, pressing 1, 2, 3, 4 allows you to taunt(make teasing sounds) to tease the prop hunters.