Pet Simulator 99 Halloween 2026 Guide: Hatch Wars, Blood Moon, Mothman Odds, and Event Tips
Posted: Mon Oct 19, 2026 1:24 pm
Quick Summary
BIG Games launched Hatch Wars on October 3, 2026 with the tagline "LUCK IS YOUR WEAPON!" The update centers on a new event zone where you face bosses in head-to-head Hatch Battles. Both sides hatch eggs simultaneously, and the rarer pets win. Tapping the glowing circles mid-battle builds a luck combo that improves your chances. Win the battle and you open the next zone, keeping every pet you hatched along the way.
The update also introduced a Giant Pumpkin mechanic. You feed spare pets to your own pumpkin, and Golden, Rainbow, and Shiny pets make it grow significantly faster. As it grows, Stalk Eggs sprout with up to 3x Huge odds, and smashing the pumpkin open gives you Lucky Bursts, the strongest luck items in the event.
There are 4 new event eggs, one in every zone, hatched with Candy you earn from breaking objects. BIG Games added 12 new pets total. The rarest is the Mothman, listed at 1 in 4,000,000,000 hatch odds. The Gargantuan Mothman only hatches in the final Hatch Battle, and the developer said "just a handful will crawl out."
On top of all that, Team Orange vs Team Blue runs across every server every 4 hours. Whether your team wins or loses, both sides fire Luck, Huge, or Coins buffs. Winning the final Hatch Battle lights a Luck Flame, and three in a row gives massive stacked luck, but one loss puts them all out.
Blood Moon: Every Two Hours, Ten Minutes of Triple Luck
The Blood Moon update went live on October 10. The headline feature is simple: every 2 hours, a Blood Moon rises over every server for 10 minutes. During that window, event luck triples and Huge and Titanic pet odds double. BIG Games' own advice is to "stack your luck, wait for the moon, then pop everything."
The update added a trick-or-treat street where you go door to door down the Count's street for loot. Each house beats the last, and the final house holds the Titanic Snoligoster. Knocking under the Blood Moon gives double loot and a moon-only Huge Count Penguin.
The Count moved into Count's Manor as the new final boss. The Gargantuan Mothman is back in his Hatch Battle with 2x the odds under the Blood Moon. The update also introduced Pumpkin Rebirth: open a full Giant Pumpkin, then rebirth it for better Huge and Titanic odds. The Titanic Count Wolf comes specifically from hatching a Giant Pumpkin under the Blood Moon.
Giant Candy Chests spawn from lucky knocks for the whole street. Everyone who helps gets loot and Candy, and chests appear 3x as often under the moon. BIG Games added 8 more spooky pets, new eggs in each zone, and 5 new upgrades: Hatch Speed, Shiny Hunter, Coin Hunter, Moon Luck, and Afterglow, which keeps the moon's luck going after it sets.
Season Pass and Event Contests
The Blood Moon update came with a new Season Pass. You earn Season Tokens by completing quests, with new quests every day and a new page every week. The headline reward was a free Huge Hippokin. The Count Booth and Hoverboard were Season Pass exclusives only on that week's page, and the developer marked them as gone forever once the week ended.
The Blood Moon League ran for 6 days and ranked players by Giant Candy Chests broken, with the Gargantuan Mothman as the top prize. The Blood Moon Leaderboard scored rare hatches under the moon, starting at 1 in 1,000.
For bursts, the developer called the new Tier III Lucky Candles, Soul Lanterns, and Lucky Spells "the strongest bursts in all of Hatch Wars." These come from your Giant Pumpkin and Blood Moon Gifts found by knocking and in the Season Pass. The advice is to pop one at moonrise for maximum effect.
How to Play the Event Efficiently
[b]Listing[/b] [b]Starts (UTC)[/b] [b]Ends (UTC)[/b] [b]Feature[/b]
HATCH WARS! Oct 3, 16:00 Oct 17, 16:00 Boss Hatch Battles, Giant Pumpkin, team events
BLOOD MOON! Oct 10, 16:00 Oct 17, 16:00 2-hour moon cycles, trick or treat, Count's Manor
NEW SEASON PASS! Oct 10, 16:00 Oct 17, 16:00 Huge Hippokin, Count Booth, Hoverboard
The Roblox listings for both events and the Season Pass closed at 16:00 UTC on Saturday, October 17. Neither BIG Games post named an end date for the event itself, so that was the listing date rather than a developer promise. On October 17, BIG Games posted its next update: Diamond Mountain. The update notes never use the word Halloween, and its Season Pass Huge is a Hiker Raccoon. Its Roblox listing runs to October 24 at 16:00 UTC.
Pet Simulator 99 is made by BIG Games Pets, a verified Roblox group with over 29 million members. The game was 20th on Roblox's Top Playing Now chart with 55,460 concurrent players when checked on October 12. The title now reads "Pet Simulator 99!" with 3,000+ pets to collect.
Are There Active Codes?
No. BIG Games does not list any public Pet Simulator 99 codes on the game description or the official Roblox group. The code redemption option in the game is tied to physical merchandise from the BIG Games shop, and those codes are one-time use only. Any "free gems" codes you see on random sites are expired or fake. The official channels to watch for future codes are the BIG Games Discord server and the BuildIntoGames Twitter page.
FAQ
Q: When does the Pet Simulator 99 Halloween event end?
A: The Roblox listings for Hatch Wars, Blood Moon, and the Season Pass ended at 16:00 UTC on October 17, 2026. The Diamond Mountain update replaced them the same day.
Q: What are the odds of hatching the Mothman?
A: The Mothman hatches at 1 in 4,000,000,000 in the Hatch Wars event. The Gargantuan Mothman only appears in the final Hatch Battle.
Q: How often does the Blood Moon rise?
A: Every 2 hours, for 10 minutes, across all servers. Event luck triples and Huge and Titanic odds double during that window.
Q: Do I need to pay Robux to get the Huge Hippokin?
A: No. The Huge Hippokin was a free Season Pass reward for completing quests during the event week. The Count Booth and Hoverboard were also free Season Pass exclusives, but only for that specific page.
Q: What is the Titanic Count Wolf and how do I get it?
A: The Titanic Count Wolf comes from hatching a Giant Pumpkin under the Blood Moon. Open a full Giant Pumpkin during the 10-minute moon window for your best odds.
Q: Can I still play the Halloween event?
A: As of October 19, the Roblox listings for the event pages closed on October 17 and the Diamond Mountain update is live. Some event zones or pets may still be accessible in game, but the official event listings and Season Pass page have rotated.
Sources
- Pet Simulator 99 got two stacked Halloween updates: Hatch Wars on October 3 and Blood Moon on October 10, both from developer BIG Games.
- Hatch Wars revolves around boss Hatch Battles where the rarer pet wins, plus a Giant Pumpkin you feed spare pets to for Lucky Bursts and up to 3x Huge odds on Stalk Eggs.
- The Blood Moon rises every 2 hours for 10 minutes, tripling event luck and doubling Huge and Titanic pet odds across every server.
- The Count moved in as the new final boss, and trick-or-treating down his street under the Blood Moon gives double loot and a moon-only Huge Count Penguin.
- The Halloween listings ended at 16:00 UTC on October 17, and BIG Games replaced them with the Diamond Mountain update the same day.
BIG Games launched Hatch Wars on October 3, 2026 with the tagline "LUCK IS YOUR WEAPON!" The update centers on a new event zone where you face bosses in head-to-head Hatch Battles. Both sides hatch eggs simultaneously, and the rarer pets win. Tapping the glowing circles mid-battle builds a luck combo that improves your chances. Win the battle and you open the next zone, keeping every pet you hatched along the way.
The update also introduced a Giant Pumpkin mechanic. You feed spare pets to your own pumpkin, and Golden, Rainbow, and Shiny pets make it grow significantly faster. As it grows, Stalk Eggs sprout with up to 3x Huge odds, and smashing the pumpkin open gives you Lucky Bursts, the strongest luck items in the event.
There are 4 new event eggs, one in every zone, hatched with Candy you earn from breaking objects. BIG Games added 12 new pets total. The rarest is the Mothman, listed at 1 in 4,000,000,000 hatch odds. The Gargantuan Mothman only hatches in the final Hatch Battle, and the developer said "just a handful will crawl out."
On top of all that, Team Orange vs Team Blue runs across every server every 4 hours. Whether your team wins or loses, both sides fire Luck, Huge, or Coins buffs. Winning the final Hatch Battle lights a Luck Flame, and three in a row gives massive stacked luck, but one loss puts them all out.
Blood Moon: Every Two Hours, Ten Minutes of Triple Luck
The Blood Moon update went live on October 10. The headline feature is simple: every 2 hours, a Blood Moon rises over every server for 10 minutes. During that window, event luck triples and Huge and Titanic pet odds double. BIG Games' own advice is to "stack your luck, wait for the moon, then pop everything."
The update added a trick-or-treat street where you go door to door down the Count's street for loot. Each house beats the last, and the final house holds the Titanic Snoligoster. Knocking under the Blood Moon gives double loot and a moon-only Huge Count Penguin.
The Count moved into Count's Manor as the new final boss. The Gargantuan Mothman is back in his Hatch Battle with 2x the odds under the Blood Moon. The update also introduced Pumpkin Rebirth: open a full Giant Pumpkin, then rebirth it for better Huge and Titanic odds. The Titanic Count Wolf comes specifically from hatching a Giant Pumpkin under the Blood Moon.
Giant Candy Chests spawn from lucky knocks for the whole street. Everyone who helps gets loot and Candy, and chests appear 3x as often under the moon. BIG Games added 8 more spooky pets, new eggs in each zone, and 5 new upgrades: Hatch Speed, Shiny Hunter, Coin Hunter, Moon Luck, and Afterglow, which keeps the moon's luck going after it sets.
Season Pass and Event Contests
The Blood Moon update came with a new Season Pass. You earn Season Tokens by completing quests, with new quests every day and a new page every week. The headline reward was a free Huge Hippokin. The Count Booth and Hoverboard were Season Pass exclusives only on that week's page, and the developer marked them as gone forever once the week ended.
The Blood Moon League ran for 6 days and ranked players by Giant Candy Chests broken, with the Gargantuan Mothman as the top prize. The Blood Moon Leaderboard scored rare hatches under the moon, starting at 1 in 1,000.
For bursts, the developer called the new Tier III Lucky Candles, Soul Lanterns, and Lucky Spells "the strongest bursts in all of Hatch Wars." These come from your Giant Pumpkin and Blood Moon Gifts found by knocking and in the Season Pass. The advice is to pop one at moonrise for maximum effect.
How to Play the Event Efficiently
- Start by breaking everything you can find in the event zone to stockpile Candy, since that is the currency for the 4 new event eggs.
- Feed your cheapest spare pets to the Giant Pumpkin first. Golden, Rainbow, and Shiny pets speed up growth more, so save those for when the pumpkin is larger.
- Enter Hatch Battles with your best eggs. Watch for the glowing circles and tap them to build the luck combo before the hatch resolves.
- Save your strongest Lucky Bursts for the Blood Moon window. A Tier III burst combined with the 2-hour moon triples your luck on top of the 3x event bonus.
- Pick a team in Orange vs Blue and check the 4-hour cycle. Even losing gives buffs, so there is no reason to skip it.
- Trick or treat under the Blood Moon for double loot. The Huge Count Penguin is exclusive to moon knocks.
- If you are chasing the Mothman at 1 in 4 billion, the final Hatch Battle under the Blood Moon with 2x odds is your best realistic shot.
Pet Simulator 99 is made by BIG Games Pets, a verified Roblox group with over 29 million members. The game was 20th on Roblox's Top Playing Now chart with 55,460 concurrent players when checked on October 12. The title now reads "Pet Simulator 99!" with 3,000+ pets to collect.
Are There Active Codes?
No. BIG Games does not list any public Pet Simulator 99 codes on the game description or the official Roblox group. The code redemption option in the game is tied to physical merchandise from the BIG Games shop, and those codes are one-time use only. Any "free gems" codes you see on random sites are expired or fake. The official channels to watch for future codes are the BIG Games Discord server and the BuildIntoGames Twitter page.
FAQ
Q: When does the Pet Simulator 99 Halloween event end?
A: The Roblox listings for Hatch Wars, Blood Moon, and the Season Pass ended at 16:00 UTC on October 17, 2026. The Diamond Mountain update replaced them the same day.
Q: What are the odds of hatching the Mothman?
A: The Mothman hatches at 1 in 4,000,000,000 in the Hatch Wars event. The Gargantuan Mothman only appears in the final Hatch Battle.
Q: How often does the Blood Moon rise?
A: Every 2 hours, for 10 minutes, across all servers. Event luck triples and Huge and Titanic odds double during that window.
Q: Do I need to pay Robux to get the Huge Hippokin?
A: No. The Huge Hippokin was a free Season Pass reward for completing quests during the event week. The Count Booth and Hoverboard were also free Season Pass exclusives, but only for that specific page.
Q: What is the Titanic Count Wolf and how do I get it?
A: The Titanic Count Wolf comes from hatching a Giant Pumpkin under the Blood Moon. Open a full Giant Pumpkin during the 10-minute moon window for your best odds.
Q: Can I still play the Halloween event?
A: As of October 19, the Roblox listings for the event pages closed on October 17 and the Diamond Mountain update is live. Some event zones or pets may still be accessible in game, but the official event listings and Season Pass page have rotated.
Sources