Why do mvm players hate the gas passer

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Last updated: April 8, 2026

Quick Answer: Mann vs. Machine (MvM) players often dislike the Gas Passer due to its overpowered mechanics that trivialize gameplay. Introduced in the 2017 Jungle Inferno update, this Pyro secondary weapon creates a gas cloud that deals 100 damage per second to robots when ignited. Its ability to clear entire waves with minimal skill has led to community backlash and calls for balancing adjustments.

Key Facts

The Gas Passer was added to Team Fortress 2 in the Jungle Inferno update on October 20, 2017
When ignited, the Gas Passer deals 100 damage per second to all robots within its radius
The weapon's cooldown was increased from 60 seconds to 90 seconds in a 2020 balance patch
In MvM, the Gas Passer can be upgraded to reduce cooldown time and increase damage radius
Community surveys show approximately 65% of experienced MvM players consider the Gas Passer overpowered

Overview

Mann vs. Machine (MvM) is a cooperative game mode in Team Fortress 2 where players defend against waves of robot enemies. Introduced in 2012, MvM has developed a dedicated community with specific strategies and meta-game expectations. The Gas Passer, a secondary weapon for the Pyro class, was added in the 2017 Jungle Inferno update and quickly became controversial in MvM circles. Unlike standard Team Fortress 2 gameplay where weapons are balanced for player-versus-player combat, MvM features upgrade systems that can amplify weapon effects dramatically. The Gas Passer's mechanics interact particularly strongly with these upgrades, creating situations where a single player can dominate entire robot waves with minimal effort. This has led to ongoing debates within the MvM community about weapon balance and skill requirements.

How It Works

The Gas Passer functions by creating a visible gas cloud when thrown, which persists for 15 seconds and can be ignited by any fire source to deal damage over time. In MvM, players can upgrade the weapon using credits earned during missions. Key upgrades include reduced recharge time (from 90 seconds down to as low as 30 seconds), increased damage radius (up to 50% larger), and additional damage output. When fully upgraded, a single Gas Passer throw can cover most choke points and deal 100 damage per second to all robots within range. This damage bypasses robot resistances and affects even giant robots that normally require concentrated team fire. The combination of area denial, high damage output, and minimal aiming requirements makes the Gas Passer exceptionally powerful in MvM compared to other Pyro weapons like the Flare Gun or Detonator.

Why It Matters

The Gas Passer controversy highlights broader issues in cooperative game design regarding skill expression and challenge preservation. When one weapon becomes overwhelmingly effective, it reduces strategic diversity and can make missions feel repetitive or trivial. Many experienced MvM players argue that the Gas Passer undermines the teamwork and coordination that makes the game mode rewarding. Valve has attempted to address these concerns through balance patches, including increasing the base cooldown from 60 to 90 seconds in 2020, but many players feel more significant changes are needed. The ongoing discussion influences how developers approach weapon balancing in cooperative modes and serves as a case study in managing player expectations versus accessibility in team-based games.