The Heads-Up Display, or HUD, is an element that appears in every Kingdom Hearts game. It is almost always at the bottom of the screen—with the exclusion of Kingdom Hearts: Chain of Memories—and details multiple things. However, HP is always present in the HUD.
In Kingdom Hearts, the HUD is in the bottom of the screen. On the very inside of the HUD, there is a picture of Sora which flinches every time damage is taken.
Surrounding the picture are multiple bars that twist around it. The innermost one is called the HP Bar, which, true to its name, details the amount of Hit Points Sora has left. The gauge increases in length as Sora increases in HP and maximum HP. When the HP reaches the Alarm Zone—the area when the HP reaches a critical level and starts flashing red—the picture changes to one of Sora with a blue tint near his hairline, his eyes shadowed.
The next and outermost bar is called the MP Bar. This bar details how much MP Sora has left for casting spells. This is divided into several sections, each one representing 1 MP. Additionally, reddish-orange bars called Charge Points line the outermost area of the MP Bar. These appear when damage is taken—if MP Rage is equipped—or when damage is given to foes. The line extends beyond the MP Bar to the extent of the size of 1 MP; when it goes beyond it, the additional MP reappears and the bar starts over again.
On the bottom left of the screen, there is a list of commands that Sora can perform. The command lists shows, from top to bottom: Attack, Magic, Items, and a bottom option which changes based on Sora's position from an enemy. In the Kingdom Hearts HD 1.5 ReMIX and Kingdom Hearts HD 1.5 + 2.5 ReMIX versions of Kingdom Hearts Final Mix the bottom command is replaced with .
In Kingdom Hearts: Chain of Memories, the HUD is in the top of the screen. Sora or Riku's HP gauge is shown at the top left of the screen. In the original game, the gauge is rectangular, while in Kingdom Hearts: Re:Chain of Memories, the HP gauge is identical in appearance to Kingdom Hearts II. In Kingdom Hearts: Chain of Memories, there is a second blue HP gauge that appears below the green HP bar if the maximum HP is greater than 280. The blue HP gauge must be depleted before the green gauge begins to run out.
Riku has a Dark Points gauge which appears next to the HP gauge in both games.