Gunstoppable Campaign Walkthrough

This walkthrough maps Fenix’s single-player campaign through five capitalist boss gates — from first contact with the giant robot crab to the orbital finale against the CEO who built Fenix into a killing machine. Gunstoppable is a momentum roguelite FPS: each run teaches movement, dual-wield flow, and Reaper Mode kill chains; death feeds permanent upgrades and Kane the Rat economies for the next attempt.

PC Steam launched August 5, 2026; Xbox Series followed August 31, 2026. Mechanics match across platforms. Watch the embedded official demo trailer mid-guide for visual pacing, then dive into specialty pages for Robot Crab, Johnny Jetpack, and Bosses Overview.

Before you start

1. Read Controls — grapple, slide, wall-run, rail-grind, parry
2. Skim Early Game Tier List — pistol-first openings
3. Understand Run Modifiers — movement mods beat raw damage early
4. Plan dual-wield pairs from Builds Tier List

Fenix’s story is fully voiced (Gianni Matragrano, Neekolul, and others). Cutscenes play during boss intros — stay ready to move when gameplay resumes.

Gunstoppable Official Demo Launch Trailer

Act I — Underwater prison to industrial dock

Floors 1–2: movement tutorial under fire

Drone packs and narrow corridors force slide shooting and reload stagger. Pick space pistols or handgun per Weapons Tier List. First run modifiers may appear — take momentum-friendly options.

Goal: enter floor three with at least one ranged weapon and basic grapple confidence from Guides.

Floor 3: Kane introduction

Kane the Rat opens his black-market shop — buy reload perks or augment rerolls before the crab. Do not overspend on damage that slows movement.

Boss Gate 1 — Giant robot crab

Arena: industrial dock with vertical catwalks.

Strategy summary:

• Establish high ground early — launch reviews note missiles striking ceiling geometry instead of players on elevation with overhead cover
• Run crossbow+pistol or dual pistols from Early Game Tier List
• Reaper during missile recovery windows

Full detail: Robot Crab guide.

Act II — Cyberpunk cityscape

Floors 4–6: density spike

Bullet-hell swarms and shielded elites replace dock simplicity. Black-hole crowd control and Reaper detonations outperform slow heavies. Flame Drift and Gravity Breaker builds climb here — see Builds Tier List.

Kane stops: prioritize pierce augments for crossbows and Reaper duration if offered.

Boss Gate 2 — Corporate enforcer

City arena with add waves and limited soft cover.

Strategy summary:

• Clear adds during Reaper freeze, burst executive shield windows with rockets or pierce
• Maintain momentum — stopping to hide loses damage multiplier

Act III — Celebrity war front

Floors 7–8: vertical pressure

Grapple routes emphasize height. Marketing spotlight Johnny Jetpack awaits — jetpack dashes, hover taunts, aerial volleys.

Prep: swap to tracking weapons (pistols, crossbows, rockets). Ground-only flamethrowers struggle.

Boss Gate 3 — Johnny Jetpack

Strategy summary:

• Build Reaper on studio security adds in Phase 1
• Burst hover spotlight in Phase 2 with rockets or pierce crossbow
• Keep moving — Johnny pursues elevation unlike the crab

Full detail: Johnny Jetpack guide.

Act IV — Military-industrial complex

Floors 9–10: shield checks

Warlord executive territory — longer bullet curtains, shield segments, elite escorts. Handgun headshot variants and pierce crossbows shine. Ensure permanent upgrades include reload or momentum tiers before this gate.

Boss Gate 4 — Warlord executive

Strategy summary:

• Break shields with pierce or sustained pistol crit lines at speed
• Save Reaper for escort clusters, not single shots into shields
• Parry melee openings if running katana secondary

Act V — Into the great beyond

Floors 11–12: composite exams

Orbital and beyond-the-city arenas remix prior mechanics — elevation, adds, shields, missile patterns. Final run modifiers before CEO gate often define run success.

Kane final shop: buy Reaper duration, reload trim, or health-on-parry for katana builds.

Boss Gate 5 — CEO approach

Strategy summary:

• Reaper Rush or maxed Velocity Hybrid per Builds Tier List
• Phase knowledge from all prior gates — nothing here is truly new, only faster
• Fenix’s narrative payoff — stay mechanical, ignore taunt timing traps

Reaper Mode across the campaign

Reaper activates from kill chains — not boss HP percentages. General rules:

• Farm chains on trash packs before boss doors when spawns allow
• Spend freeze on telegraphed burst windows (crab missile recovery, Johnny hover, CEO shield break)
• Reposition during slow-time — unpause into slash or rocket line, not idle aim

Deep dive: Guides and Reaper-focused tier notes.

Economy loop between deaths

Each death ends temporary augments but awards currency for permanent upgrades. Kane’s inventory expands as metaprogression unlocks. Typical loop:

1. Learn boss pattern (crab high ground, Johnny vertical tracking)
2. Invest permanent momentum
3. Push one gate farther with upgraded Items economy
4. Repeat until CEO falls

Loadout quick reference by act

Act	Suggested build	Boss
I	Dual pistols → hybrid	Robot crab
II	Gravity Breaker	Corporate enforcer
III	Velocity Hybrid	Johnny Jetpack
IV	Piercing Sniper	Warlord executive
V	Reaper Rush	CEO gate

Adjust per augment RNG — Weapons Tier List explains shifts.

Related pages

• Bosses Hub — all encounters
• Items Hub — Kane, currencies, modifiers
• Tier List Hub — build rankings
• Tools — future route planners

Fenix livestreams revenge. Your run livestreams improvement. Clear the five capitalist bosses, then rewrite the ending.