by Underground's RNG Community
Undertale: Underground's RNG Codes
Working Undertale: Underground's RNG Codes
Last updated August 21, 2026
No working codes right now
We're tracking Undertale: Underground's RNG and will list codes here the moment the developers release them. If you spot one first, send it our way below.
How to redeem codes in Undertale: Underground's RNG
- Launch Undertale: Underground's RNG on Roblox.
- Look for a Codes, Shop or settings button — usually on the side of the screen.
- Paste the code exactly as shown above. Codes are case-sensitive.
- Press redeem to claim your reward.
Codes expire without warning — if one fails, it was almost certainly pulled by the developer.
Found a code we're missing?
Submit it and we'll verify it before it goes live.
About Undertale: Underground's RNG
Welcome to Underground's RNG! An Undertale - Deltarune Fangame! Codes: SoulsWeek — 500,000 bones, 5 godly luck potions and a godly lootbox SoulsUpdate — 300,000 bones, 5 godly and 5 medium potions, 5 normal and 2 skeleton lootboxes PvPArena — 250,000 bones and 6 medium luck potions ButItRefused — 200,000 bones and 3 godly luck potions TheKingReturns — 150,000 bones, 4 medium potions and a skeleton lootbox BadTime — 150,000 bones and 5 normal lootboxes Roll to discover different underground timeline characters, collect rare companions, earn Bones from duplicates, upgrade your luck, increase roll speed, use potions, claim daily rewards, and unlock titles. Complete the Index, show off your best finds, and keep rolling for the rarest timelines. New characters, effects, titles, and rewards coming soon. Tags: Undertale,Deltarunes, Sans aus, Undertale RNG, sans undertale, Deltarune