You first begin the game with three health points (symbolized by hearts), but you can increase the amount up to 16 by picking up the Heart item, making this game the only one that allows you to do this. It may be or may not be intentional, considering that the game is rather buggy, lacking any form of mercy invincibility (the next three games still have this problem, but not as bad).
Starting from this game, you begin with the maximum amount of health (depending on game). In this game, maximum health consists of 9 health points (symbolized by green squares).
Just like HTFA 2, the maximum amount of health playable character can have is 9 health points. It also uses a similar health bar.
This game's maximum health for playable characters is 10, one point more compared to the previous two games. Instead of green squares, the health bar consists of green bars.
The maximum health is now reduced to 8 health points, much like in HTF Origins. The health bar in this game consists of hearts, similar to the first HTFA.
The health system is the same as in HTFA 5.
The health bar consists of 8 hearts. The same concept is then used in HTFA 5 and 6.
This game has the least amount of health points a playable character can have compared to other HTFA games, with 5 health points. The health bar consists of hearts.
This game, as well as HTFA 7, uses a gauge to measure the playable character's health. Assuming that the character takes damage from conventional hazards and no healing items can be picked up, it takes 9 hits to kill him/her.
This game re-uses the same health system as in HTF Origins, 5 and 6, albeit using different graphics for the hearts.
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The health system is similar to HTFA 4, but the health bar's design consists of yellow bars instead of the green ones.