WASD keys
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WASD (also conceptually known by common ESDF and IJKL) is a set of four keys on a QWERTY or QWERTZ computer keyboard which mimics the inverted-T configuration of the arrow keys. These keys are often used to control the player character's movement in computer games. W/S control forward and backward and A/D control strafing left and right. Primarily, WASD is used to account for the fact that the arrow keys are not ergonomic to use in conjunction with a right-handed mouse.
Many gamers[who?] consider the WASD keys to be superior to the arrow keys[citation needed] for other various reasons, including the fact that more keys (and therefore, game commands) are easily accessible with the left hand when placed near WASD. Left-handed mouse users may prefer using the numpad or IJKL with their right hands instead for similar reasons.
After being popularized by first-person shooters, WASD became more common in other computer game genres as well[citation needed]. Many of the games that have adopted this layout use a first-person or over-the-shoulder third-person perspective.
[edit] Popular variations
The ESDF variation is sometimes preferred because it provides access to movement independent keys for the little finger (Z, A, SHIFT) which generally allows for more advanced manual binding. Incidentally, it allows the left hand to remain in homerow with the advantage of the F key homerow marker (available on most standard keyboards) to easily return to position with the index finger. "ESDF" is the default configuration for several games such as Tribes 2. The game Blackthorne used a combination of arrow keys for movement and ESDF for actions.
"IJKL" is used by a growing number of browser games. These games cannot use the arrow keys because many browsers' windows will scroll if the arrow keys are used, thus hindering gameplay. "ESDF", "IJKL" etc, like WASD, are arranged in an ergonomic inverted T shape, and, since they are used by the right hand, adjustment is easy for people who commonly use the arrow keys.
Another old-style variation that spawned from games like Quake, was the "SDF-SPACE" layout. In this layout, s=turn left, d=forward, f=turn right, space=backpedal, e=strafe left and r=strafe right. This layout allows for a player to aim with the mouse while strafing(sidestepping), turning and running or backpedalling all at once creating slightly more complex movements. This variation is not favoured any longer for two main reasons. First, because many players deem the turn commands useless because the mouse can act as a turning device, and so they assign "S" and "F" to the sidestep commands and leave the turn commands unassigned. The second, and probably more prominent reason is, in assigning both the turn and strafe commands, performing movements and dodges can be much more confusing, so newcomers tend to not prefer this key setup. Though no longer widely used, many FPS veterans and tournament players still employ this key setup. All in all, WASD still remains the most popular keyboard setup.
[edit] Less common variations
Some gamers shift further across to RDFG, to give the little finger access to more keys.
Another variation is W-A-X-D, used by people who are used to the arrows on the numeric keypad (which has the down arrow a line below the left/right arrows, instead of in between).
Also common is the HJKL (h=left, j=down, k=up and l=right) layout used in the Unix computer world, a practice spawned by its use in the ubiquitous vi text editor. The editor was written by Bill Joy for use on an Lear-Siegler ADM-3A terminal, which places arrow symbols on these letters. An example of a game that uses HJKL is the text-based "graphic" adventure NetHack.
Vaguely related is the ZXC layout, used in many freeware games, and a common setup for emulation and older 2D gaming using a keyboard.[citation needed] An OPAQ layout was also common for full-keyboard games.[citation needed]
AZERTY users will use the "ZQSD" combination instead, since those are the keys in place of WASD on a QWERTY keyboard. On the Dvorak Simplified Keyboard, "WASD" would be ",AOE".
Another, close, variation is the WQSE combination, which follows the belief that the index and ring fingers' natural and more ergonomic position when the middle finger is on 'W' is Q and E rather than A and D, respectively. This can be attested to by the fact that the arrow keys were partly designed in the inverted T shape in order to avoid having the side buttons possibly directly underneath other keys.[citation needed] It also has the advantage that there is less distance needed to travel to reach the number keys. For similar reasons, some gamers use the WQSD combination (which is WASD with the 'A' key moved up to 'Q', or WQSE with the 'E' moved down to 'D'). For players who prefer to keep the keyboard centered on the body, this allows for less wrist rotation, as it places the index finger naturally over the 'D' key when the left arm rests down to the left of the keyboard.
Left-handed players may use the numeric keypad instead.
