Pet Simulator 99: PSX Classic, Free Huge Pet and Halloween Games on 31 October

Pet Simulator 99 has three event pages on Roblox this week, and together they show what is live and what starts on Halloween. This post sums them up with their dates. Most of it comes from the studio's own event descriptions, plus one fan wiki page, so exact rewards, odds and requirements are not listed here because those sources do not give them. If you are new to the game, start with our Pet Simulator 99 beginner guide.

Update 99: Pet Simulator X Classic

The event page called "Update 99" runs from 24 October to 31 October 2026 (16:00 UTC). It says the Update 99 gate is open and that you can play Pet Simulator X Classic inside Pet Simulator 99. The page lists these points:

• PSX is now part of Pet Simulator 99, and you can step into 2021 to earn Pet Simulator 99 rewards.
• If you hatch a Huge pet, the page says you keep it in both Classic and Pet Simulator 99.
• There is a Clan Battle and a leaderboard to top.
• A Diamond Mountain refresh adds more diamonds, eggs and pets, with a chance of Huge, Titanic and Garg pets.

The Pet Simulator 99 Wiki lists a Classic Event 2026 that began on 25 October 2026 and is expected to end on 1 November 2026, with PSX Coins as its currency. It says you can reach the event from any world, from the spawn area. The wiki page is still short and marked as unfinished, and its dates differ slightly from the Roblox page, so treat the Roblox end time as the one to follow.

Season Pass week 3: a free Huge pet

The second page is for week 3 of the new Season Pass, from 24 October (16:05 UTC) to 31 October 2026 (15:55 UTC). It promises a free Huge pet, a new booth and a hoverboard, many diamonds to claim, and boosts and potions. You earn the new exclusive items through a quest. The page warns that these rewards are available only this week, so the practical advice is to finish the quest before the end time listed on the page.

Halloween Games start on 31 October

The third page is for the Halloween Games, from 31 October (16:00 UTC) to 7 November 2026 (17:00 UTC). It says Update 100 lands on Halloween and describes a survival style event: only the bravest make it to the end, knocked out players still have something to do, and the last ones standing win big. It asks players to follow the event for more news, which means the details have not been published yet.

A simple plan for the week

1. Before 31 October, finish the Season Pass week 3 quest to claim the free Huge pet.
2. Try the Classic gate and the Diamond Mountain refresh while they are live.
3. Check the event page again on 31 October for the Halloween Games rules.
4. Remember that spending Robux costs real money, so ask a parent or guardian first.

What we do not know yet

The pages do not tell us the odds for Huge, Titanic or Garg pets, how Clan Battle points are counted, or how the Halloween Games are scored. We will update this post when the studio publishes more.