Gunstoppable Run Modifiers Guide

Run modifiers are Gunstoppable’s in-run roguelite choices — temporary buffs selected during floors that last until Fenix dies or clears the campaign. Press kits mention unlocking modifiers after deaths to enhance combat abilities; demo materials reference bullet-time blasts, elemental augments, and experimental fusions on the hex grid. Modifiers differ from permanent upgrades (which persist forever) and from Kane the Rat purchases (run currency shop stock).

This guide explains modifier types, pick priority, synergy with tier lists, and boss-specific value across Bosses Hub encounters. Pair with Items Hub, Weapons, and Controls.

How run modifiers appear

Typical roguelite flow:

1. Clear arena or elite pack
2. Offer three modifier choices (exact UI may vary by patch)
3. Pick one — immediate passive or active buff
4. Stack multiple modifiers across a run until death

Some modifiers alter weapons directly; others buff Fenix movement, Reaper generation, or economy. They interact with hex-grid attachments documented on Weapons — placement still matters.

Modifier categories

Movement and momentum mods

Slide distance, grapple speed, momentum damage multiplier, air control — top priority for most runs because speed scales all damage. Promotes pistol and katana entries in Weapons Tier List.

Reaper mods

Faster kill-chain fill, longer freeze, exit detonation — essential before Johnny Jetpack and CEO gate from Campaign Walkthrough.

Elemental and weapon-type mods

Fire, freeze, pierce, explosive bias — elevate shotguns, crossbows, launchers when matching augment already slotted. Can promote B-tier grenade launcher to S-tier with banana synergy.

Dual-wield mods

Off-hand damage, stagger window extension, simultaneous fire stability — supports Builds Tier List Velocity and Reaper Rush archetypes.

Economy mods

Bonus currency, Kane discount this run, extra reroll — strong when upcoming floor is Kane stop before robot crab or mid-campaign bosses.

Defensive mods

Parry heal, damage reduction while moving, shield on slide — stabilizes melee without camping.

High-risk high-reward

Glass cannon, double damage taken, absurd augment odds — speedrun novelty; avoid on first CEO attempts.

Pick priority by run stage

Stage	First pick	Avoid early
Floor 1–2	Movement or reload	Boss-only damage vs adds
Pre-crab	Pierce or pistol bias	Slow heavy exclusive
Mid city	Reaper fill rate	Ground-only fire if Johnny next
Late	Reaper duration stack	Redundant economy if wallet full

Cross-check Early Game Tier List when rolling first modifiers on new accounts.

Synergy examples

Velocity Pistols spike

Momentum mod + dual-wield reload mod + pistol damage bias = S-tier early game without Kane yet.

Gravity Breaker spike

Explosive mod + black-hole pull radius + Reaper exit burst = add melts before Bosses Overview enforcer gate.

Banana chaos spike

Launcher augment mod + explosive bias + Kane reroll economy mod = meme run into CEO if RNG cooperates.

Document combos in personal notes — wiki tier lists track averages, not your seed.

Modifiers vs Kane vs permanent

Source	Timing	Persists
Run modifier pickup	Mid-floor	Run only
Kane purchase	Shop stop	Run only
Permanent upgrade	Run end menu	Forever

Ideal runs stack permanent momentum and run movement mod and Kane reload perk — triple multiplier on speed meta.

Boss-specific modifier value

Robot crab

Pierce bias and mid-range stability outperform slow rocket mods — pairs with high-ground strategy on Robot Crab guide.

Johnny Jetpack

Vertical mobility and tracking mods beat ground fire augments.

CEO gate

Reaper duration stacks — save pick slots late campaign for freeze-heavy modifiers.

Common mistakes

• Flat damage mod while movement stays base — wastes Gunstoppable’s core scaling
• Conflicting mods — two reload mods when one hand never fires
• Ignoring augment hex — modifier buffs freeze but weapon lacks pierce for shields
• Skipping modifier room for speedrun — underpowers Kane-funded builds

Related links

• Items Hub — all item systems
• Permanent Upgrades — between-run tree
• Kane the Rat — shop complements
• Tools — future modifier databases

Run modifiers are chaos per broadcast. Stack movement first; let absurdity follow.