How do they stop the flood in Halo 3?

In Halo 3, the Flood threat is stopped (temporarily) by Master Chief activating a replacement Halo ring (Installation 08) on the Ark, which fires and sterilizes the local area, destroying the Gravemind's forces and itself due to being incomplete, but it doesn't eliminate the Flood entirely, leaving remnants for future encounters. The Flood's main body, the Gravemind, was on the infected city High Charity, which was destroyed by Chief, but the Gravemind was trying to rebuild on the new Halo.
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How was the Flood defeated in Halo 3?

The Flood was "defeated" in Halo 3 by being cut off from their food source (sentient life) and trapped when the replacement Halo ring (Installation 08) fired, destroying the Gravemind and vast amounts of Flood biomass on the Ark, while Arbiter's forces glassed Earth to contain outbreaks there, though remnants survived in containment on the Ark and potentially other Forerunner facilities. 
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How did the Flood not take over Earth in Halo 3?

Basically because there wasn't enough time. The bulk of elite forces were quarantining the delta halo outbreak and mostly succeeded in containing it outside that one cruiser and High Charity itself.
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How does Halo stop the Flood?

The parasite is depicted as such a threat that the ancient Forerunners constructed artificial ringworld superweapons known as Halos to contain it and, as a last resort, to kill all sentient life in the galaxy in an effort to stop the Flood's spread by starving it.
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Why is there no Flood after Halo 3?

It's most likely an oversight, Bungie admitted to this a ton in the dev diaries. They just either ran out of time, or the idea was cool and they wanted to use it regardless. Like high chairty was a literal planet sized flood ball, yet sends like 30 flood to stop it's destruction.
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How the Flood survived Halo 3

Are Spartans immune to the flood?

No, Spartans aren't truly immune, but they possess significant resistance due to genetic enhancements (Spartan-I) or armor/skills (Spartan-II/III/IVs), making infection very difficult but not impossible, with infected Spartans becoming terrifying, powerful combat forms, especially older models where the Flood can corrupt Mjolnir armor. Sergeant Johnson (Spartan-I) showed partial immunity, but later generations are less resistant, though still formidable targets.
 
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What is the saddest death in Halo?

Cortana in halo 4 sacrificing herself to save John from the nuke with the last of her energy. Or Dom sacrificing himself in gears of war 3 to save his team from the lambent bye driving into the Imulsion vats and blowing himself up.
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Who is immune to the Flood in Halo?

Immunities and Defenses

At this time, the only known human to be incompatible with Flood infection forms is Staff Sergeant Avery Johnson due to his supposed contracting of Boren's Syndrome. This was thought to be caused by the residual detonation radiation of a crate full of plasma grenades on Paris IV.
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Why did the Forerunners keep the Flood alive?

In the real world we keep deadly viruses intact in case we need to cure them in the future, they had hopes that another species would find the cure where they could not: The Forerunners were forced to kill all life in the galaxy to stop the Flood, if they succeeded there is nothing to cure.
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Was the gravemind destroyed in Halo 3?

In the end, the Gravemind was destroyed as Halo's activation destroyed itself and the Flood that had escaped containment. In its final moments, however, the Gravemind addressed the Master Chief telepathically one last time, with an ominous warning: "Resignation is my virtue, like water I ebb and flow.
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Did the UNSC win any battles?

Battle of New Constantinople, Covenant glassing of New Constantinople. Battle of Leonis Minoris, Covenant destruction of Leonis Minoris. Siege of the Atlas Moons was a rare victory for the UNSC, as victories in space-based fighting were uncommon for the UNSC Fleet.
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Are Flood hosts still alive?

A host becomes a Combat Form after an Infection Form enters its body. Transformation involves brutal mutations that makes the host more suitable for combat. This process is presumably very painful and terrifying, and will kill the host; though, in certain circumstances, the host is still alive.
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Can the Flood ever be wiped out?

In the end, they had to wipe out large portions of the galaxy just to stop the Flood—not to kill them, just to delay them. The Flood can only be dealt with through massive, galactic-scale destruction.
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Who created the Flood?

The "creator" of the Flood depends on context: in the Halo universe, it's the ancient Precursors, god-like beings who corrupted their own regenerative dust out of spite for the Forerunners. In religious contexts, stories like Noah's Flood describe God sending it to cleanse the world of humanity's wickedness. Various cultures also have myths of creators sending floods to punish giants or the wicked, such as the Inca deity Viracocha.
 
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Are hunters immune to the Flood?

Yes, Hunters (Mgalekgolo) are effectively immune to Flood infection in their combined form because they lack a single central nervous system, being colonies of individual Lekgolo worms, making typical Flood control impossible. While individual worms could theoretically be infected as biomass, the gestalt entity's complex distributed intelligence and structure prevent conversion into standard combat forms, though the Flood can still consume them for raw matter.
 
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How was the arbiter not infected by the flood?

It makes sense that J-117 was not infected, as he presumably has an air filtration system.
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How did the world get repopulated after the flood?

According to the Biblical narrative, the world repopulated after the flood through Noah's three sons—Shem, Ham, and Japheth—and their wives, who were the only humans to survive on the ark, multiplying and spreading across the Earth as God commanded them to "be fruitful and multiply". This process involved intermarriage among the sons and their cousins, establishing new family lines that eventually formed all the peoples of the world. 
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How do Forerunners reproduce?

Genetic Creations

Forerunners have the technology to reproduce entire individuals from encoded DNA/RNA/silicon samples in data streams.
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Could the flood infect Master Chief?

In Halo: The Flood, Master Chief almost becomes infected by an infection form when it penetrates into his chest and almost manages to reach his spine. In The Mona Lisa, a Marine was slashed by a Combat Form and was infected that way.
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What's the most powerful weapon in Halo?

The "best" weapon in Halo is subjective, but the Magnum (Halo: CE) (for its overpowered versatility) and the Halo 2 Battle Rifle (for its hitscan precision and dominance) are iconic for multiplayer, while the Energy Sword, Gravity Hammer, and Sniper Rifle are top power weapons for their sheer destructive force across the series. The ideal weapon often depends on the game and situation, from the Plasma Pistol's shield-breaking ability to the Needler's supercombine explosions.
 
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Why was Johnson not infected by the flood?

The Flood attempted to infect Johnson but he was able to shrug off the effects due to the complications of his Boren's Syndrome.
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Why is Spartan 117 so special?

John-117, the Master Chief, is special due to his status as a genetically and cybernetically enhanced SPARTAN-II super-soldier, making him humanity's most decorated and effective soldier, a legendary symbol of hope, and a pivotal figure in saving humanity from the Covenant by turning the tide of numerous battles through impossible feats, combining immense physical ability with tactical genius, unwavering determination, and a touch of almost supernatural luck.
 
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Does the USA still exist in Halo?

No, the United States of America as a sovereign nation does not exist in the Halo universe by the 26th century; it dissolved and merged with Canada and Mexico to form the United Republic of North America (URNA), though its cultural remnants heavily influence the human United Nations Space Command (UNSC). The URNA incorporates the "political remnants" of the former US, suggesting internal conflicts, possibly even a Second American Civil War, led to its dissolution before the events of the games.
 
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What is the saddest game ever?

There's no single "saddest" game, as it's subjective, but popular contenders for emotionally devastating experiences include What Remains of Edith Finch, for its poignant exploration of family death, Red Dead Redemption 2, for its epic, tragic farewell, Spiritfarer, about guiding souls, and Valiant Hearts: The Great War, for its real-world WWI sorrow, with many citing The Last of Us series for intense loss and sacrifice as well.
 
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