Swarm Bunker Lust Defense Upgrade Priority Checklist
Buy in this order to avoid dead-end scrap spends through Act III.
Use this checklist while playing Swarm Bunker Lust Defense on Steam (app 4403260). Items are ordered by return on investment for standard single-player bunker defense. Skip a row only when Walkthrough or Stage tracker notes prove you do not need it for the next chapter.
Cross-reference Weapons tier list, Turrets tier list, and your main heroine on Characters hub.
Act I — Foundation (copy checklist)
- Clear tutorial defense + hub intro (How to Play)
- Sell starter pistol after first MG purchase
- Buy first MG (any tier above rust pistol)
- Install first auto-gun turret on longest lane (Turrets guide)
- Reach bond tier 2 with planned main heroine (Bond system)
- Unlock first combat bond node (Celine Steady Feed / Lina Quick Loader / Nora Tight Pattern)
- Upgrade MG to blue tier before sidearms
- Save scrap buffer (~500) before Act I boss—do not buy duplicate turrets
- Optional: combat shotgun if next map is funnel (Nora route)
- Clear Act I boss; unlock Act II shop row
Act II — Coverage and AoE
- Purchase rocket launcher blueprint OR artillery slot (pick armor if elites hurt; pick RL if trash leaks)
- Upgrade auto-gun turret to Mk II
- Bond tier 3 + second combat node for main heroine
- Second turret slot — flame (funnel) OR rocket turret (armor)
- MG → HMG path if maining Celine; RL tier-two if maining Lina
- Shotgun tier-two if maining Nora on indoor chapters
- Run one night with off-route heroine for map weakness test
- Cross-check failures on Stage tracker before luxury mods
- Unlock Unlock scenes tier-4 gate if scene chasing
Act III — Optimization
- HMG tier-two OR RL tier-two (whichever is primary)
- Artillery tier-two if armor waves persist
- Third turret slot (if story unlocked) — sniper OR second auto-gun by map
- Bond tier 5 + advanced active skill
- Sidearm cleanup mod (low priority until above complete)
- Luxury cosmetics / gallery — after defense stable
- Review Best Build for min-max variant
- Post-patch re-check Updates before tier-three weapon mods
Route-specific branches
Celine (MG focus)
- Steady Feed before HMG tier-three
- Turret Sync before second auto-gun Mk II
- Artillery before rocket turret unless walkthrough says armor gate
Lina (explosive focus)
- Quick Loader before RL tier-two
- Shell Sync before rocket turret Mk II
- Keep one auto-gun for trash—do not triple explosive
Nora (breach focus)
- Tight Pattern before shotgun tier-three
- Flame turret before sniper turret
- MG secondary mod before doubling flame investment
What NOT to buy early
- Second duplicate MG before artillery/RL answers armor
- Sniper turret before auto-gun Mk II
- Tier-three sidearm before bond tier 4
- Three flame turrets on wide-map chapters
- Luxury bunker decor before Act II clear
Scrap priority table
| Priority | Purchase | Why |
|---|---|---|
| 1 | First auto-gun | Stops lane leaks |
| 2 | First MG + bond node | Personal DPS floor |
| 3 | AoE tool (RL or artillery) | Armor checks |
| 4 | Turret Mk II | Scale without aim skill |
| 5 | Heroine-aligned weapon tier-two | Bond multipliers |
| 6 | Third slot / sniper niche | Chapter specific |
After each patch
- Read Updates for weapon/turret/bond keywords
- Re-run one failed chapter before full respec
- Update personal copy of checklist if wiki revises order
Related resources
- Tier List hub — letter grades for each item
- Stage tracker — log scrap income per chapter
- Wiki review — broader meta context
- Controls & Steam Deck — if handheld delays your aim upgrades
Frequently Asked Questions
Quick answers to the most common questions.
What if I am scrap poor after a fail streak?
Replay Act I farm chapter on [Walkthrough](/guides/walkthrough/) or reduce difficulty once—checklist assumes standard clears.
Can I rush artillery before MG?
Only if personal DPS already stable with borrowed heroine buffs—usually a mistake before Act II.
Does checklist differ on hard mode?
Order stays same; add +1 turret Mk II priority before weapon tier-three on hard.
Where are weapon tier details?
[Weapons tier list](/tier-list/weapons/) and [Turrets tier list](/tier-list/turrets/).