Two of Roblox's most recognizable simulators sit at opposite ends of the genre spectrum. Giant Simulator by Mithril Games (Place ID: 2986677229) puts you in control of a massive, growing character that crushes enemies and battles other players in a PvP arena. Pet Simulator 99 by BIG Games (Place ID: 16584709926) drops you into a bright, sprawling world where hatching eggs, collecting thousands of pets, and trading with other players is the whole point. Both have loyal fanbases and proven longevity, but they offer fundamentally different experiences. This side-by-side breakdown covers every major category so you can decide which one deserves your time in 2026.
Whether you're a returning player picking one game to commit to or a newcomer trying to figure out where to start, the sections below cover everything from core mechanics to how each studio handles monetization. We've spent considerable time in both titles this year to bring you an honest, detailed look at what each one does well -- and where it comes up short.
| Category | Giant Simulator | Pet Simulator 99 |
|---|---|---|
| Developer | Mithril Games | BIG Games |
| Roblox Place ID | 2986677229 | 16584709926 |
| Total Visits (2026) | 700M+ | 8B+ |
| Avg. Concurrent Players | 3,000 - 8,000 | 40,000 - 80,000 |
| Core Gameplay Loop | Grow giant, fight enemies, PvP | Hatch eggs, collect & trade pets |
| Pet System | Support role (stat boosts) | Primary focus (2,000+ variants) |
| PvP | Yes (arena & open-world) | No |
| Trading | Basic system | Advanced (Trading Plaza) |
| Classes / Roles | Warrior, Mage, Ninja | None (pet-focused) |
| Rebirth System | Yes | Yes |
| Update Frequency | Every 3-6 weeks | Every 1-2 weeks |
Giant Simulator is a growth-and-combat experience at its foundation. You start as a small character, run around collecting glowing orbs scattered across the map, and watch your giant physically increase in size with every batch collected. As you grow taller and stronger, you unlock new zones, take on tougher NPC enemies, and eventually enter the PvP arena to pit your build against real opponents. The class system adds a genuine strategic layer -- Warriors specialize in heavy melee damage with high HP pools, Mages deal ranged area-of-effect damage from a distance, and Ninjas rely on speed, stealth, and critical-hit multipliers.
Pet Simulator 99 takes a completely different approach to the simulator genre. The gameplay revolves around hatching eggs to discover new pets, then deploying those pets to break open coin boxes and treasure chests scattered across themed worlds. Each world has higher coin thresholds than the last, requiring stronger pets to advance efficiently. The loop seems simple on the surface -- hatch, collect, upgrade, move forward -- but the sheer volume of pets (over 2,000 unique variants as of early 2026) and the layered enchanting system create meaningful depth once you're past the first few hours.
At their cores, these are two very different games wearing the same "simulator" label. Giant Simulator feels closer to an action RPG with simulator progression mechanics. Pet Simulator 99 feels like a pure collector's game with incremental systems layered on top. If you want active combat where your reflexes and build choices matter, Giant Simulator delivers that. If you prefer a more relaxed, collection-driven grind where optimization is the challenge, Pet Simulator 99 is the stronger pick.
Giant Simulator features real-time combat against both NPCs and other players. Boss fights at higher tiers require actual strategy -- timing dodges correctly, managing cooldowns on class-specific abilities, and positioning yourself to avoid area-of-effect attacks. The PvP arena adds another dimension entirely, with skill-based matchups that reward knowledge of hit ranges, ability combos, and movement tech. There's a real skill ceiling here that separates casual players from top-ranked arena fighters.
Pet Simulator 99 has no direct combat system in the traditional sense. Your equipped pets automatically attack nearby coin containers and event enemies when you walk into range. The "challenge" is entirely about optimizing your pet loadout for maximum damage output, not about mechanical execution. Some limited-time events introduce raid-style boss encounters, but these still depend on aggregate pet strength rather than player reflexes or positioning.
Edge: Giant Simulator. If active gameplay, skill expression, and player-versus-player competition matter to you, Giant Simulator wins this category without question. Pet Simulator 99 is intentionally passive in its interaction model, which serves a different audience well but doesn't offer the same gameplay depth.
Both games use rebirth systems as their primary long-term progression hooks, but they execute the concept in noticeably different ways. In Giant Simulator, rebirthing resets your size and accumulated currency in exchange for permanent stat multipliers and access to new content tiers. Each rebirth carries weight because it gates new class abilities, additional pet slots, and entirely new map areas behind it. The progression curve is steep by design -- reaching true endgame status requires commitment across dozens of rebirths, each one taking longer than the last.
Pet Simulator 99 ties its progression to unlocking new worlds by accumulating enough coins and aggregate pet power. There are over 150 worlds available as of 2026, each featuring its own unique egg types, themed environments, and coin multipliers. The rebirth equivalent here involves resetting world progress in exchange for permanent boosts called "Enchants" that carry forward into every future run. The early curve is forgiving and fast-paced, keeping new players engaged, but it becomes exponentially grindier past world 80 or so.
Giant Simulator layers its progression through several interconnected systems that reward planning. Your class choice directly affects stat distribution and available abilities. Pets provide passive bonuses that stack with your class build. The rebirth tree branches into different specializations, letting you focus on PvP dominance, PvE efficiency, or a hybrid approach. There's genuine build-crafting here that rewards game knowledge and experimentation.
Pet Simulator 99 focuses its depth almost entirely on the pets themselves. Every pet has a rarity tier ranging from Common to Exclusive. Pets can be upgraded through the "Golden" and "Rainbow" transformation pipeline, each step multiplying their base stats. The enchanting system adds another layer, with enchantments like "Strength," "Coins," and "Diamonds" altering effectiveness in specific scenarios. Huge pets -- the rarest tier in the game -- function as both power multipliers and high-value trading currency. The complexity emerges from managing a collection of thousands of pets and knowing which ones to keep, which to fuse, and which to trade.
Giant Simulator uses a semi-realistic art style with large, open landscapes that emphasize scale above all else. The core visual hook is watching your character grow -- as your giant gets taller, the surrounding terrain, buildings, and NPCs shrink in comparison. It's a genuinely satisfying feedback loop that never fully loses its appeal. Ability particle effects look solid across all 3 classes, and the PvP arena features some of the better dynamic lighting work you'll find in a Roblox simulator. The soundtrack stays ambient and unobtrusive, fitting the exploration-heavy gameplay without becoming repetitive during long sessions.
Pet Simulator 99 takes the opposite approach and aims for maximum visual impact at every turn. Each of the 150+ worlds is brightly colored, densely detailed, and visually distinct from its neighbors. Pets have unique idle animations, and the Huge-tier pets feature elaborate particle effects and scaling that makes them impossible to miss in any server. BIG Games clearly invests heavily in art direction -- each major content drop brings entirely new visual themes, from candy kingdoms to cosmic voids. The audio is upbeat and purpose-built around satisfaction, with hatching sounds, upgrade chimes, and coin-collection effects designed to trigger that "just one more" feeling.
Both games look good by Roblox standards, but they're targeting entirely different aesthetics. Giant Simulator goes for an epic, sense-of-scale atmosphere. Pet Simulator 99 goes for a vibrant, dopamine-rich visual experience. Neither approach is objectively superior -- it comes down to personal preference.
The population numbers here are not close. Pet Simulator 99 consistently maintains 40,000 to 80,000 concurrent players and has accumulated over 8 billion total visits since its launch. It regularly appears in Roblox's top 10 most-played experiences list. The community extends well beyond the game itself, with active Discord servers boasting hundreds of thousands of members, dedicated YouTube creators producing daily content, and third-party value-tracking websites that monitor pet trading prices in real time.
Giant Simulator sits at a more modest 3,000 to 8,000 concurrent players with 700 million-plus total visits. That's still a healthy population by most Roblox standards -- plenty of games would love those numbers -- but it's roughly a tenth of what Pet Simulator 99 commands on any given day. The Giant Simulator community is tighter-knit as a result, with dedicated veterans who've stuck around since the game's earliest updates. Finding populated servers is rarely a problem, but the social experience is noticeably quieter.
A larger player base has cascading effects on several gameplay elements. Pet Simulator 99's trading economy is vastly more liquid -- you can find buyers and sellers for almost any pet within minutes at the Trading Plaza. Giant Simulator's trading scene exists but moves at a much slower pace. Content creators also produce far more Pet Simulator 99 videos and guides, which means strategy resources, tier lists, and code compilations are more readily available and frequently updated.
Edge: Pet Simulator 99. A roughly 10x difference in concurrent players creates a fundamentally different community experience. Pet Simulator 99's massive player base supports a thriving trade economy, abundant creator content, and consistently active servers at all hours.
Giant Simulator sells game passes ranging from 99 to 1,999 Robux. The key offerings include the 2x Orbs pass at 499 Robux, a VIP pass with exclusive cosmetic items and area access at 999 Robux, and various class-specific booster passes priced between 149 and 799 Robux. The monetization feels relatively restrained overall. Free players can access all core content areas, and the paid passes primarily accelerate progression rather than gating meaningful content behind them. A daily spin system hands out free rewards to every player, pass holder or not.
Pet Simulator 99 has a broader and more aggressive monetization structure. Game passes range from 99 to 4,999 Robux, with the highest-tier options unlocking exclusive areas, auto-hatching functionality, and boosted luck modifiers. The "Huge Hunter" game pass at 2,499 Robux is particularly notable -- it increases your odds of hatching ultra-rare Huge pets, which are the most valuable trading assets in the game. BIG Games also runs limited-time bundles, seasonal event passes, and rotating premium offers that create spending urgency. Free-to-play progression is entirely possible, but the gap between free and premium players widens significantly in the later worlds.
Neither game crosses into strict pay-to-win territory -- you can reach endgame content in both without opening your wallet. But Pet Simulator 99 leans harder into monetization, with more premium touch points, higher price ceilings, and more visible advantages for paying players. Giant Simulator is the more budget-friendly option for players who want a complete experience without constant reminders to spend Robux.
Giant Simulator's social layer is built around competition and cooperation. The PvP arena is inherently social -- you're fighting real opponents, forming rivalries, tracking leaderboard positions, and learning from losses against better players. Clans provide a team structure where groups of players can share resources, coordinate grinding sessions, and participate in clan-versus-clan events during special updates. The game also supports basic peer-to-peer trading, though the economy is far less developed than what you'll find in dedicated pet-collecting games.
Pet Simulator 99 engineered its entire social infrastructure around the trading experience. The dedicated Trading Plaza is a persistent hub zone where players gather to negotiate deals, showcase rare pets, browse each other's inventories, and haggle over values. The trading interface includes confirmation screens, item-value displays, and built-in protections against common scam tactics. Beyond trading, the game features a booth system that lets you set up automated pet shops while AFK, plus cooperative server-wide events where every player contributes toward shared milestone rewards.
The social philosophies differ sharply. Giant Simulator's social experience is competitive and combat-oriented -- you're interacting with other players primarily as opponents or teammates. Pet Simulator 99's social experience is cooperative and commerce-driven -- you're interacting with other players primarily as trading partners and event collaborators. Both models work well for their respective audiences.
Edge: Pet Simulator 99. The Trading Plaza alone represents one of the most polished social systems in any Roblox simulator. Combined with the booth system, cooperative events, and the sheer number of players available to interact with, Pet Simulator 99 offers a richer and more structured social environment.
Giant Simulator derives its replay value from 2 main sources: the class system and the PvP arena. Playing through the entire progression curve as a Warrior feels fundamentally different from doing it as a Mage or Ninja. Each class has unique abilities, optimal orb-farming strategies, different PvE strengths, and distinct PvP matchup profiles. Completing the game on all 3 classes effectively triples the content. On top of that, the rebirth system creates an ongoing push for higher tiers, and the PvP arena provides an endgame with no hard ceiling -- there's always a better player to learn from or a higher rank to chase.
Pet Simulator 99 draws its replay value from constant content updates and the collector's instinct. BIG Games adds new worlds, egg types, pet variants, limited-time events, and system features on a near-weekly cadence. The collector's drive to obtain every pet -- especially the ultra-rare Huge variants that can take weeks of grinding or clever trading to acquire -- keeps dedicated players engaged for months at a time. Trading itself becomes a metagame for veteran players, with many spending more time negotiating deals than actively grinding, effectively treating the game like a virtual marketplace.
The distinction comes down to depth versus breadth. Giant Simulator offers fewer but deeper reasons to keep playing -- class variety, skill improvement in PvP, and pushing rebirth milestones. Pet Simulator 99 offers a broader but shallower set of hooks -- new content every week, an ever-expanding pet catalogue, and an evolving trade economy. Competitive players will find more long-term challenge in Giant Simulator's skill-based systems. Collectors, completionists, and social traders will find more sustained engagement in Pet Simulator 99.
Edge: Pet Simulator 99. The volume of content updates and the self-sustaining depth of the trading economy give Pet Simulator 99 stronger week-over-week staying power for the average player. Giant Simulator's PvP keeps its hardcore fans coming back, but the update pace simply cannot match what BIG Games delivers.
Want active, real-time combat where mechanical skill and reflexes matter. Enjoy class-based progression systems where your build choices create meaningfully different playstyles. Prefer a tighter, more veteran-oriented community with an old-school simulator atmosphere. Like the unique visual satisfaction of watching your character physically tower over the landscape. Want a more budget-friendly experience where game passes feel optional rather than expected.
Love collecting things and the satisfaction of filling out an ever-growing catalogue. Enjoy player-to-player trading and participating in a real, liquid economy. Want frequent content updates that keep the experience feeling fresh every single week. Prefer a relaxed, low-stress gameplay loop where optimization replaces mechanical challenge. Value being part of a massive, active community with abundant guides, videos, and social opportunities.
Have the time and want variety in your Roblox rotation. These 2 games complement each other well precisely because they scratch completely different itches. Use Giant Simulator for your active, competitive sessions when you want to test yourself against other players. Switch to Pet Simulator 99 when you want a laid-back collecting grind you can do while watching a video or chatting with friends. Alternating between the two prevents burnout in either title and keeps your Roblox time feeling varied.
Pet Simulator 99 is the stronger overall package in 2026 for the majority of Roblox players. Its massive 40K-80K concurrent community, weekly content updates, polished trading infrastructure, and accessible core loop make it one of the best simulator experiences on the platform for good reason. It earned its 8 billion visits through consistent quality and relentless content delivery.
However, Giant Simulator offers something Pet Simulator 99 simply cannot replicate -- genuine combat depth, meaningful class-based build crafting, and competitive PvP with a real skill ceiling. If you value action-oriented gameplay and skill expression over collecting and trading, Giant Simulator is the better game for you, full stop.
Neither title is a bad choice. They serve different players with different priorities, and the right pick depends entirely on what you're looking for when you load up a Roblox simulator.
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Pet Simulator 99 is significantly more popular. It averages 40,000 to 80,000 concurrent players and has surpassed 8 billion total visits. Giant Simulator averages 3,000 to 8,000 concurrent players with over 700 million visits. Both games maintain active communities, but Pet Simulator 99 has a much larger and more visible player base across Roblox, Discord, and YouTube.
Pet Simulator 99 is generally more accessible for beginners. Its core loop of hatching eggs, collecting pets, and exploring worlds is straightforward and rewarding from the very first session. Giant Simulator has a steeper learning curve due to its class system, active combat mechanics, and PvP elements that can feel overwhelming before you understand how builds and rebirths work.
Yes, both games are completely free to play on Roblox. Each offers optional game passes and in-game purchases for Robux, but all core content is accessible without spending a single Robux. Free-to-play progression is slower in both titles, though Pet Simulator 99 has more premium-gated content areas and a wider gap between free and paying players in the late game.
Pet Simulator 99 has a far more developed trading ecosystem. Its dedicated Trading Plaza, established community value lists, and massive active player base create a thriving in-game economy where you can buy and sell almost any pet within minutes. Giant Simulator supports basic peer-to-peer trading, but the volume, liquidity, and infrastructure do not come close to what Pet Simulator 99 offers.
Giant Simulator does include a pet system, but pets serve a support role by providing passive stat boosts to your giant character -- they're one piece of your overall build. In Pet Simulator 99, pets are the entire focus of the game. You hatch, collect, upgrade, enchant, fuse, and trade them as the primary gameplay loop. The two systems share a name but serve fundamentally different purposes.
Pet Simulator 99 receives more frequent and larger updates, typically every 1 to 2 weeks with new worlds, pet variants, seasonal events, and feature additions. Giant Simulator updates arrive less often, roughly every 3 to 6 weeks, though individual updates tend to include substantial content like new map areas, class rebalances, or boss encounters. Pet Simulator 99 wins on cadence; Giant Simulator compensates with update depth.