- The face bleeds as the player's health diminishes. The health ranges corresponding to each face type are as follows:
Player health Default face appearance* 80% - 200% Completely healthy 60% - 79% Bloody nose,
hair slightly mussed
40% - 59% Face swollen,
20% - 39% Eyes crossed slightly, face
dirty and bleeding
1% - 19% Similar to 20-39%, but
0% (Dead) Similar to 1-19% but
with eyes closed
- In the Sega 32X and Game Boy Advance ports, the status bar face does not bleed at all when the player's health status worsens, although the rest of the effects of damage (progressively messier hair, closed eyes when dead, and so on) are there. Conversely, in the Super NES port, the blood on the face is much more pronounced, and the cutoffs for the next-worse-looking face are higher; the state that would normally appear from 20% to 39% health approximately appears at below 50%, for example.
- In most versions, should the player die, the head becomes bowed, hair completely disheveled, eyes closed, and about as bloody as the 1% - 19% face. The face explodes when the player dies in the 3DO port, and when the player experiences a gibbing death or being crushed in the PlayStation port.
- If the player is attacked from the side, the face will turn to the direction of the attack. This gives a helpful visual cue as to the direction attacks are coming from (the face does not turn if the attack came from behind). This feature does not appear in the Super NES port, possibly due to memory limitations.
- If the player picks up a new weapon, the face momentarily displays a malicious grin. This also happens when a player opens a previously saved game at the first item he picks up (at this point it doesn't have to be a weapon).
- If the player holds down the fire button for more than 2 seconds, the face grits its teeth until the player ceases fire. The face also grits its teeth briefly if the player takes damage.
- In the original PC version the face will grit its teeth when it first takes damage on a damaging floor and each time afterward. On the PlayStation and Saturn ports, should the player run onto a damaging floor, the face will grit its teeth right away regardless of whether or not the player took damage.
- If the player is hurt, yet has a net gain of more than 20% health during the damaging event, a rarely displayed "ouch face" expression of shock and pain is shown (originally intended to represent a net loss of 20% health or more; this has been fixed in many source ports and even through a binary hack). This face also appears in the Doom press release beta when the player enters a damaging floor, and sometimes in the PlayStation and Sega Saturn ports when the player is hit from behind.
- If the player is invulnerable (because "god mode" is active or the player has picked up an invulnerability powerup), the player has glowing golden eyes, similar to the demon's.
- In the various ports of Doom, the eyes of the face will look left, right, and straight ahead arbitrarily, changing direction every second or so. However, due to limitations with the SNES 16-bit cartridge, the face looks around in a specific manner (left, right, left, left, right, left, right, right) over and over in a more rhythmic fashion, looking ahead every half-second.
The names of the face graphics use the root STF (status face), plus some text specifying one of several conditions currently being experienced by the player, followed by a digit from 0 to 4 denoting the approximate current health, and possibly an extra digit from 0 to 2 for an alternating animation sequence that makes the face gaze in different directions (forward or to either side) when idle. In the graphic STFST01, for example, the root STF is followed by ST (standard face), then 0 (full health), and finally 1 (looking forward). Face graphics that do not vary with the character's health, such as the invulnerable and dead faces, always carry a single 0 after the specifying text.
The text that specifies what type of face is used includes:
|ST||Glancing around warily (default)||0-2|
|TL|| Looking to his right (attacked|
from left side of screen)
|TR|| Looking to his left (attacked|
from right side of screen)
|OUCH|| [[Ouch f|}
Additionally, STFGOD0 appears while an invulnerability powerup or the iddqd cheat code is in effect. Note that STFOUCH4 is but rarely displayed, and in only unusual circumstances, due to the ouch face bug.
The health values correspond to the player's health percentage: