Last checked: September 11, 2026

KAT (Knife Ability Test) vs Blade Ball (2026) -- Which Roblox PvP Game Wins?

By Money Lord — Founder & Editor | Updated: September 11, 2026

This page was rebuilt on September 11, 2026, because the version before it compared Blade Ball to the wrong game: it cited place ID 4592931260, an abandoned 2020 lookalike by the user JustXua with 301,872 visits and nobody in it. Fierzaa's KAT lives at place ID 621129760, and every number below is re-sourced against that place and against Blade Ball's place 13772394625.

Quick Stats: KAT vs Blade Ball

Core Gameplay: Knives vs Deflection

KAT is a free-for-all in which every player is armed, not a hunt in which one person holds the knife. You carry a knife as your primary and a gun as your secondary. The knife is charged by holding the attack input and released as an arcing projectile dealing 100 damage — an instant kill on a clean hit — while the gun is hitscan and owns long range. It runs three modes: Classic, a timed free-for-all of roughly 13 minutes; Elimination, the same with one life; and Murder, the asymmetric innocents-sheriff-murderer mode. The "one player gets the knife, everyone else runs" description that circulates for KAT has collapsed the whole game into that third mode.

Blade Ball puts every player in a circular arena where a homing ball bounces between targets at increasing speed. When it locks onto you, a timing window opens in which you press deflect; nail it and the ball rockets at someone else, mistime it and you are out. The window shrinks after every deflection, and swords with different deflect properties add a loadout layer on top.

Edge: KAT for varied combat inputs; Edge: Blade Ball for a distilled, high-tension format.

Skill Ceiling and Learning Curve

KAT's ceiling lives in the knife: the throw must be charged, it arcs and drops over distance, and a clean hit kills outright — so one correct read ends an exchange and one mistimed charge hands one over. Beginners are not locked out, because the hitscan gun gets them kills while they learn. Blade Ball has one of the lowest barriers to entry on Roblox, one button press at the right time, and a ceiling that is narrower but just as deep, since the parry window shrinks with every deflection. It is a reaction game; KAT is an aiming game.

Edge: KAT on breadth of mechanical skill -- with the caveat that at 234 concurrent players you are practising against a very small pool, and skill you cannot use is not much of an advantage.

Progression, Skins, and Unlocks

KAT's real progression system is knife powers, not knife skins, and its currency is gems — not coins. Eleven powers change how your thrown knife behaves, and each changes what a kill pays: 2 gems with Ghost Knife or Explosive Knife equipped, 1 with Laser or Noscope, and nothing at all with Deathbeam. Gun kills pay 1. So the powers are not an upgrade ladder — Deathbeam costs 6,000 gems and then zeroes your knife income, which is why Explosive Knife at 100 gems is the purchase that funds the rest. Skins are separate and purely visual. We publish no gems-per-hour figure: no source states one, and the rate depends on your loadout.

Blade Ball's equivalent is swords, bought with coins, each changing how the deflect behaves, with auras and trails as the cosmetic layer. Both games therefore have a progression layer that changes play and a cosmetic layer on top, and both support trading — Blade Ball sells a Trading Sign pass for 112 Robux; KAT's trading is built in. The difference is liquidity: a trading economy needs a counterparty, and Blade Ball has roughly 87 times as many people online to be one. For funding either, see our KAT free Robux guide and Blade Ball free Robux guide.

Edge: Blade Ball on progression in practice, purely because a 20,000-player market is one you can trade in. Edge: KAT on design, for the gem-per-power tradeoff, which is a genuinely interesting economy rather than a linear unlock track.

Game Passes and Monetization

Every price below was read from the Roblox game-pass API on September 11, 2026. KAT's universe holds 16 game passes, of which 10 are on sale: Dead Meme (25), Spray (50), Radio (60), VIP (95), Kill Effect Transfer (120), Shard Knives (195), Shotgun Knife (195), MVP (200), MLG Bundle (350) and Tesla Knife (450). The six that are not — Rapid-Fire, XP Booster, SCAM, SCAM 2.0, Fierzaa Laptop Fund and Spam Knife — return isForSale: false with no price.

KAT's VIP pass does not carry a coin or gem multiplier. An earlier version of this page sold "a permanent 2x coin multiplier at 95 Robux", and that was wrong twice over: KAT's currency is gems, and the pass's own description lists the coin cloud pet, the Australium knife skin, a VIP chat tag and chat emotes. The only KAT pass that speeds up progression is MVP at 200 Robux, which pays extra gems for killing your assigned target. Shotgun Knife (195) and Tesla Knife (450) replace your knife power outright.

Blade Ball's universe holds 5 game passes, of which 4 are on sale: Trading Sign (112), Instant Spin (120), Double Coins (240) and VIP (240); Radiant Veil is off sale. The "2x currency for Robux" pass the old version of this page attributed to KAT is in fact this Double Coins pass. We quote no battle-pass price, because battle passes sell as rotating developer products and no endpoint we read today returns a stable figure for one.

Edge: KAT -- its whole on-sale lineup tops out at 450 Robux and its progression pass costs 200, against 240 for either of Blade Ball's headline passes. Neither game sells combat power.

Community Size and Social Experience

The vibe of a PvP game depends heavily on who is playing it and how the community interacts, both in-game and outside of it.

This is the dimension most KAT comparisons get wrong, and it is not a matter of taste. On September 11, 2026 Blade Ball read 20,411 concurrent players on 6,407,278,059 lifetime visits, with 12,891,015 favourites and a 93.5% rating. KAT read 234 concurrent players worldwide on 1,481,074,036 lifetime visits — not 10,000 to 20,000, and not 2.2 billion visits. Those figures circulate widely, including on the earlier version of this page, and no live endpoint returns them.

KAT was put under Roblox review on August 1, 2025 and re-released on March 19, 2026 with saved progress and content restored. The content came back; the population did not. Nearly six months on it is a game with a deep history, a 4.2-million-favourite back catalogue and a few hundred people in it. Small games can be good games — but this one decides whether a full 22-player lobby exists at the hour you log in. Its Discord is at least verifiably official: the invite discord.gg/QxvdptB was created by Fierzaa's own account and held 32,770 members on September 11, 2026.

Edge: Blade Ball, decisively -- roughly 87 times the concurrent population and 4.3 times the lifetime visits.

Map Design and Game Modes

KAT rotates through multiple arena layouts, several lifted from Mad Games, which it borrows from openly for knives, guns and map styles. Some are tight corridors where the gun and a short throw dominate; others are open, where the arcing knife rewards a good lead. Its mode variety is the three modes named above. An earlier version of this page listed "Gun Mode, Bomb Mode and Juggernaut Mode" for KAT; no source we can find supports those, and they have been removed rather than rewritten.

Blade Ball's arenas are uniform by design: ball trajectories need clear, predictable paths, so variety arrives through swords and abilities instead of geometry.

Edge: KAT -- varied map layouts plus three distinct rule sets give it more structural variety than Blade Ball's deliberately uniform arena design.

Update Frequency and Developer Support

Both dates below are Roblox's own last-republish stamp for the universe, read on September 11, 2026.

Blade Ball was last republished on September 9, 2026 — two days before this check — and its most recent badge, "Blade Ball x Black 17", was created on August 14, 2026, dating a crossover event. It is published by Wiggity., Roblox group 12836673, a verified group whose own description reads "Creators of Blade Ball". The "Blade Ball Team" credit this page carried before was not the name of anything on Roblox.

KAT was last republished on June 2, 2026 — roughly three months of silence, and less than three months after the relaunch. Its universe carries exactly one badge, "Meet an admin", created in 2017 and awarded 71,457 times; none has been added since the return, which is usually the first thing a resumed cadence produces. We found no dated developer statement promising updates, so we will not repeat this page's old claim that the cadence is "picking up".

Edge: Blade Ball, decisively -- a live update cadence against roughly three months of silence.

Platforms, Input and the Murder Mystery 2 Question

Both games run everywhere Roblox does. KAT is a 2017 game and runs like one, which here is a compliment: it holds up on older devices. Its servers are the larger of the two, at 22 players against Blade Ball's 16, so a thin server is a population problem rather than a design one. Mouse and keyboard is a real advantage in KAT, since precision aiming pays twice over; Blade Ball's single-press parry is the easier input on a touchscreen.

One point worth settling: KAT contains a Murder Mystery 2-shaped mode rather than being one. Classic and Elimination hold no hidden information — everyone is armed. So if what you want from KAT is MM2, you want one of its three modes, in a game with 234 people in it. Blade Ball has no deception element at all.

Who Should Play What?

Choose KAT if you:

• Want a charged, arcing projectile you have to lead, plus a hitscan gun to switch to by range
• Like the gem-per-power economy, where the strongest power pays nothing and the 100-gem one pays double
• Want three rule sets (Classic, Elimination, Murder) rather than one
• Are happy with a 234-player game and will check the server list at the hour you play

Choose Blade Ball if you:

• Prefer a single, clean mechanic that is easy to learn but hard to master
• Want a 20,000-player community, frequent events and sword loadout strategy
• Want a game that is still being republished -- last on September 9, 2026
• Are on mobile, where a single-press parry beats leading an arcing throw

More KAT and Blade Ball

• KAT hub — current update, live player numbers, every KAT guide.
• KAT codes — why there are none, plus six archived codes from a different game.
• KAT guide — eleven knife powers, the gem economy, every pass at its API price.
• KAT Music IDs — how the Radio pass works.
• Blade Ball hub — the current Blade Ball update.
• Blade Ball codes — Blade Ball does have a live code system.
• Blade Ball free Robux guide — abilities, swords, spins.

Frequently Asked Questions