Health

Health is a property of Humanoid objects that determines the current vitality of that Humanoid. By default, players spawn with 100 health. Whenever Health drops to 0, the Humanoid dies (indicated by all joints in the model that houses the humanoid breaking), and the Died event fires. If the head is detached from the torso, the Humanoid's Health is automatically set to zero. In an experience, by default when Health drops to 0 in any way except falling from a baseplate, the humanoid will make an "uuhhh", or what is mostly referred as the "oof" sound. When a Humanoid being thrown at high speed then the Health drops to 0, the death sound becomes more low-pitched or high-pitched depending on how fast the humanoid is being thrown, due to RollOffMode properties.

Once a player dies (the player's body parts breaking apart, and their accessories and gear they would've been holding out falls off), they normally must wait 5 seconds to respawn. There is an occasional glitch where the player's body parts do not break apart upon losing all of their health.

A script is added by default that causes the health of player characters to regenerate automatically. By default it restores 1% of the maximum health every second. By using scripts, users can alter how fast the health is restored, if it regenerates at all, or make the health gradually reduce over time, among other things.

Health GUI
Roblox's health GUI was a bar representing a player's character's current Health (the size of the green or red bar) and MaxHealth (the size of the current health bar is determined in the proportion of MaxHealth). The Health GUI is placed near the center of the bottom of the Player's screen. The standard health GUI can be edited and even removed by Scripts and LocalScripts.

As of 2015 the Health GUI is no longer a separate GUI but is integrated into the default Roblox's in-game interface.

History
Since the beginning of Roblox, there has been a hard-coded GUI for the health bar (as in one which could not be modified by the user). As of the introduction to the Lua interface, the current health GUI now appears instead.

At first, the health bar was on the right side of the screen, which is a green bar that turns red when health lowers. Also, blue text saying "Health" is under it, in the font, "Eras Demi ITC". In the 3rd version, it was made taller. The font "Comic Sans" was also replaced with a different font, called "Arial Black".

In the fourth version, it changed completely, it is now on the bottom and white text saying "HEALTH" is inside it. Also, when a large amount of health is reduced, a certain area of the health bar flashes red and white, when the player's health was low, the health bar turned red. A notable change is what looks like blood when the player dies instantly or loses a large amount of health appears on the corners of the screen.

Around March 2011, the health bar kept its same design, but it was moved to the bottom center of the screen, below the backpack, instead of being on the slight bottom left, next to a couple menu buttons. The health bar was also slightly shrunken and horizontally squished. When the player lost a large amount of health, the health bar will simply flash white once, instead of repeatedly flashing red and white.

In the fifth version, some rather minor changes were made to the health bar. The health bar no longer blinks when a large amount of health is lost, the edges of the health bar were sharpened instead of rounded like the previous variant, the health bar now empties to the left side of the health bar instead of the right, and the font was also changed. The only detail that carried over to the fifth version is the green shaded texture used for the health bar.

For the sixth version, first implemented on August 27, 2014, the health bar was simplified with a lighter green color and with rounded edges. The word "Health" was removed, and the bar will now look white when a player loses all of their health.

In 2015, the seventh version made it so that the health bar was put in the leaderboard, below the player's name, with square edges and is thinner than before. In 2017, the eighth version made it so that no health bars will appear when the health is equal to the maximum health of a Humanoid, this includes the default health bar that shows the player's health and the health bar that appears above humanoids. In 2020, the ninth and current version of the health bar was placed outside of the leaderboard, appearing in the top left corner of the screen when taking damage. The health bar is now thicker and has a black outline on the outside of it. It also has rounded edges, like the sixth version of the health bar.



Trivia

 * The color of the health bar varies on the amount of health the player has. The more health one has, the more green it will become. The less health one has, the more red it becomes.
 * In various games (such as Jailbreak), players are scripted to walk slower when they have low health.
 * The original death sound can be found here.
 * If a player dies when they are lagging, then half of the Roblox "oof" sound plays instead of the whole death sound playing.
 * If a player explodes with a high blast pressure, then half of the Roblox "oof" sound plays as well due to the head of the player being flung.
 * Roblox was once about to get sued by Tommy Tallarico, the sound composer for another video game called Messiah, for using the death noise.
 * The health bar is located at "content/textures/ui/TopBar" in the Roblox Files.
 * Trying to make the size larger doesn't work. However editing the icon in height can increase the health GUI by 2 pixels.


 * When taken damage, there is a brief frame of red around the edges of the screen. The file of this is located at "content/textures/ui/TopBar" named "WhiteOverlayAsset.png" but appears to be white instead of red.
 * The current health bar sometimes take more damage than the original player has. This results in the health bar goes negative and turns into red on the left side.