Seeds Guide

What a Seed Controls

Every run uses a numeric seed displayed at the bottom-right of the HUD and in the developer console. That value drives floors, entity picks and pathing, task layouts, code paper placements, Terminal upgrades, consumables, traps, malfunctions, blessings and curses, anticipation messages, and floor music—unless a physics-based roll overrides it.

  • White: Natural run, no modifiers
  • Green: Seeded custom lobby run
  • Red: Modifiers active (natural or seeded)
  • Blue: Daily Mode run
  • Yellow: Reserved / TBA

Parameters That Shift the Same Seed

Identical seeds only replay identically when parameters match. Delver count can unlock larger floors earlier. Player Luck shifts luck-based item rolls. Server Luck raises unusual floor weights and can force overrides on a given floor of that seed. Upgrade detours (Pit Stop, Break Room) fork generation. Modifiers rewrite outcomes wholesale.

Daily Mode shares one global seed, but party size and luck still create divergent runs—scoreboards compare results under those realities, not a single cinematic replay.

Custom Lobby Seeds

Enter any numeric seed in a Custom Lobby to replay Daily configs, rare unusual floors, or boss practice. Seeded custom runs grant no money, information, or badge progress—Foxxive’s anti-farm rule from v0.6.8.

Valid unique inputs top out at 2^53 − 1 (9,007,199,254,740,991). Higher values lose integer precision and collapse toward seed 0; extreme overflow can resolve to a unique INF seed. Negative inputs currently force seed 0 even though developers have stated negative seeds are real. Non-numeric input is ignored and becomes a natural run.

Notable Community Seeds

Community Discord collections highlight unusual early encounters useful for Atlas practice. Examples (solo-friendly where noted): 173609331 Baseplate Floor 2; 552885201 Familiar Rooms Floor 6 (0.2 server luck); 1715001164 Tycoon Floor 2; 1251616088 map_test.rbxl Floor 3; 355281971 Obby Floor 1; 1414458806 Flesh Pit/Home Floor 3; 1228355128 Mansion Floor 13; 2020951063 Console Floor 2; 477355381 Witness Floor 2 with Zero Chance, Speed Spelunking, Broken Legs, and OSHA Non-Compliant.

Seeds can change meaning after content updates when pools expand. Re-verify after Recode and Epilogue ships.

Related Guides

Frequently Asked Questions

Do seeded runs give money?
No. Custom seeded lobbies grant neither money, info, nor badge progress.
Why did my Daily seed feel different from a friend?
Party size, luck, detours, and modifiers alter generation even on the same seed number.
What colour is Daily Mode?
Blue seed colour marks Daily Mode runs.
Can I use negative seeds?
Negative inputs currently resolve to seed 0; developers have confirmed negative seeds exist as a concept.

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