Mutation Strategy — How Stacking Actually Works

Mutations are the single biggest multiplier on your hourly income in Storage Hunters: Open World, and they're also the most-misunderstood mechanic. There are 24 documented mutations, ranging from Dirty (0.8x — yes, that lowers the price) to Void (35x — the highest obtainable). The community has confirmed multipliers for 20 of them; Black, Secret, Rainbow, and Huge are still unverified or unobtainable.

The Additive Rule

This is the part most guides get wrong. When an item rolls multiple mutations, the multipliers add — they do not multiply. A Silver (2x) plus Gold (4x) item sells for 6x base, not 8x. A theoretical Void (35x) plus Diamond (8x) plus Gold (4x) would total 47x, not 1,120x.

If you want to plan a specific stack, run the numbers through the Mutation Stacker Calculator on this site. It loads the 24 mutations with their numeric multipliers and the catalogued item base prices, so you can preview the final sell value for any combination before you commit time to chasing the items.

Tier Ranking by Multiplier

The eyeball ranking, lowest to highest among confirmed multipliers:

• Negative: Dirty (0.8x)
• Common (1.0–2.0x): Cobwebbed (1.2x), Pure (1.5x), Moonlit (1.5x), Silver (2x), Tiny (2x), Antique (2x)
• Uncommon (3–5x): Spotless (3x), Gold (4x), Firefly (5x), Ancient (5x)
• Rare (6–8x): Corrupted, Wet, Shocked (all 6x), Diamond (8x)
• Epic (10–15x): Gem (10x), Chrome (12x), Timeless (12x), Hologram (15x)
• Legendary (35x): Void

Practical Stacking Advice

Three rules that hold across most playstyles. First, never sell a Dirty item raw — even one extra mutation cancels the negative penalty. Second, target Exclusive-category items (the head/back/wrist accessories) for the highest-mutation rolls because their base price is already 100–15,000x typical junk items, so multipliers compound on a much bigger base. Third, the Mutation Stacker shows that a Scrap Dominus ($565 base) with a single Void mutation hits $19,775 — more than any vanilla Exclusive accessory in the game.

What This Guide Skips

Mutation drop rates, the in-game roll system, and per-area mutation odds are not yet documented in the official Fandom or in any reliable community source. We'll add a roll-odds section once the data is reproducible.