Undertale Adventures X Wiki
Undertale-Themed Tower DefenseDefend your base against monster waves in this Roblox tower defense game. Summon Undertale-inspired units, level up your team, improve traits, and progress through challenging stages.
Latest Updates
Undertale Adventures X Beginner Guide: Early Game Units, Traits & Farming Tips
Undertale Adventures X How to Beat Hard Mode: Placement, Traits, and Upgrade Guide
Undertale Adventures X Meta Team Guide: Best Units, Traits, and Tower Defense Strategy
Undertale Adventures X Tutorial: Beginner Guide to Units, Traits, and Codes
Undertale Adventures X: How to Beat Last Corridor — Full Strategy Guide
Undertale Adventures X: How to Beat Neutral Corridor Act 1 (Full Team & Strategy Guide)
Undertale Adventures X: How to Evo Summon Mythic Units (2026 Guide)
Undertale Adventures X: How to Get Evolve Items (Complete 2026 Guide)
Start Here
Your Undertale Adventures X Journey
Beginner Guide
Learn the core deploy, upgrade, and defend loop, then pick a practical early-game path before chasing rare units.
All Codes
Redeem MOREFREESTUFF and every future Undertale Adventures X code for free Souls, Trait Rerolls, and Gaster Hands.
Best Starter Units
Balance area damage, single-target boss killing, and front-line units so your first runs stop leaking waves.
How to Evolve
Turn Souls and unit materials into permanent power spikes with the evolution path instead of temporary leveling.
Popular Pages
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Undertale Adventures X Beginner Guide: Early Game Units, Traits & Farming Tips
A complete Undertale Adventures X beginner guide covering first deployments, upgrades, farming routes, traits, and summoning plans for Roblox players.
Undertale Adventures X How to Beat Hard Mode: Placement, Traits, and Upgrade Guide
Struggling with Undertale Adventures X hard mode? Learn upgrade priority, path placement, role-appropriate traits, and a farming loop.
Undertale Adventures X Meta Team Guide: Best Units, Traits, and Tower Defense Strategy
A practical Undertale Adventures X meta team guide: roles, trait rerolls, resource spending, and free codes to build a squad that clears chapters.
Undertale Adventures X Tutorial: Beginner Guide to Units, Traits, and Codes
A complete Undertale Adventures X tutorial covering your first match, the four combat roles, trait rerolls, codes, and progression systems.
Undertale Adventures X: How to Beat Last Corridor — Full Strategy Guide
Learn how to beat the Last Corridor in Undertale Adventures X with the right team comp, traits, upgrade order, and placement tips that stop leaks.
Undertale Adventures X: How to Beat Neutral Corridor Act 1 (Full Team & Strategy Guide)
Learn how to beat Neutral Corridor Act 1 in Undertale Adventures X with Mettaton NEO leader buffs, Knight Knight DPS, Woshua soak, and leak control.
Undertale Adventures X: How to Evo Summon Mythic Units (2026 Guide)
Learn how to evo summon mythic units in Undertale Adventures X — requirements, evolution steps, Souls, rerolls, and the mistakes that stall your first mythic.
Undertale Adventures X: How to Get Evolve Items (Complete 2026 Guide)
Learn how to get evolve items in Undertale Adventures X, from story chapter drops and raid rewards to codes and trading, plus fast farming routes.
Undertale Adventures X All Units: Roster Guide, Roles, and Team Building
A full guide to Undertale Adventures X all units: how summoning works, which roles to prioritize, and how to build a team that clears every chapter.
Undertale Adventures X Core Sans Evolution: Full Unit Guide, Traits, and Placement Tips
Undertale Adventures X Core Sans evolution explained: upgrade scaling, trait picks, placements, and mode-by-mode performance.
Undertale Adventures X Corridor Dust Sans Guide: Stats, Drops, and Team Synergy
A complete Undertale Adventures X Corridor Dust Sans guide: unlock steps, Blood typing, stacking passives, leader skill rules, and team synergy.
Undertale Adventures X Delta Sans Evolution: Full Unit Guide & Showcase Tips
A complete Undertale Adventures X Delta Sans evolution breakdown: unit role, placement, trait picks, mode value, and investment tips for Sans players.
Undertale Adventures X Dustdust Showcase: Corridor Dust Sans Unit Guide
A full Undertale Adventures X dustdust showcase breakdown: how to unlock Corridor Dust Sans, his two-move kit, leader skill, and best team synergy.
Undertale Adventures X Sans Showcase: Stats, Traits & Best Builds
A full Undertale Adventures X Sans showcase: stats, traits, placement tips, team synergy, and progression advice for the game's top S-tier unit.
Undertale Adventures X Swap Papyrus Showcase: Unit Guide, Team Builds & Trait Tips
Plan an Undertale Adventures X Swap Papyrus showcase with role tips, placement maps, trait priorities, and a recording checklist for tower defense runs.
Undertale Adventures X: Possession Sans, Overgrowth Rumors & Meta Units Explained
Undertale Adventures X guide: possession Sans and Overgrowth terms explained, plus the S-tier meta lineup, traits, Raids tokens, and AFK Chamber tips.
Undertale Adventures X Battlepass Towers: Progression and Defense Guide
A mechanics deep dive into Undertale Adventures X battlepass towers, covering progression, tower roles, rewards, and tips for clearing chapters faster.
Undertale Adventures X Best Starter Units: Early-Game Team Guide for New Players
New to this Roblox tower defense? Learn how to pick the Undertale Adventures X best starter units, balance team roles, and roll traits that carry you.
Undertale Adventures X Evolution Guide: How to Evolve Units and Farm Souls Fast
A complete Undertale Adventures X evolution guide covering Souls, Soul Fragments, trait rerolls, unit priorities, and free rewards to speed up your upgrades.
Undertale Adventures X Limited Units: Unlock, Summon, and Build Guide
Learn how Undertale Adventures X limited units work, where to get them, how to budget Souls, and how to build a team that clears chapters first try.
Undertale Adventures X Shiny Units: Traits, Odds, and Farming Guide
Learn how Undertale Adventures X shiny units work, how traits and levels stack, and the fastest farming routine for building a shiny-ready team.
Undertale Adventures X Summon Guide: Souls, Units, and Rerolls Explained
This Undertale Adventures X summon guide covers Soul Fragments, unit summoning, trait rerolls, and the codes that fund your tower defense squad.
Undertale Adventures X Unit Tier List: S to B Ranks and Roles Explained
A community-built Undertale Adventures X unit tier list covering Sans, Asriel, Mettaton NEO, and more, with roles, substitutes, and team tips.
Undertale Adventures X Corridor Guide: Neutral Corridor Act 1 Walkthrough
Beat Neutral Corridor Act 1 with this Undertale Adventures X corridor guide covering Mettaton NEO's leader buff, Knight Knight DPS, and Woshua soak.
Undertale Adventures X Endless Mode: A Survival Guide for Long Runs
Learn how endless mode works in Undertale Adventures X: wave scaling, unit traits, team comps, and tips to push your tower defense runs deeper.
Undertale Adventures X Hotland Act 6 Genocide: Modes, Regions, and Farm Guide
A practical guide to Undertale Adventures X Hotland, Act 6, and Genocide mode: region order, unit rosters, kill grinds, and how to pick the right act.
Undertale Adventures X Raid Act 1 Guide: Best Teams, Rewards, and Clear Tips
A practical walkthrough of the Undertale Adventures X Raid Act 1 mode, covering prep, unit roles, strategy, rewards, and the codes worth redeeming.
Undertale Adventures X Raid Act 2 Guide: Team Setup, Unlock Steps, and Clear Strategy
A practical Undertale Adventures X Raid Act 2 guide covering unlock conditions, team roles, unit placement, upgrade order, and reward planning tips.
Undertale Adventures X Raid Act 3: Mode Guide, Units & Token Tips
Undertale Adventures X Raid Act 3 explained: how the raid acts work, the best units and traits for a clean clear, and how to farm Tokens faster.
Undertale Adventures X Snowdin Act 6 Genocide: Full Mode Guide and Strategy
Master the Undertale Adventures X Snowdin Act 6 Genocide mode with unlock steps, unit picks, wave tactics, and reward tips in this full guide.
Undertale Adventures X Codes (October 2026): Free Souls and Rerolls
All active Undertale Adventures X codes for October 2026, plus how to redeem them for Souls, Trait Rerolls, and Gaster Hands in Roblox.
Undertale Adventures X Best Team Guide: Roles, Traits, and Progression
Build the Undertale Adventures X best team with role-based lineups, trait priorities, and stage-by-stage progression tips for this Roblox tower defense.
Undertale Adventures X No Limited Units Guide: Clear It Without Banners
A complete Undertale Adventures X no limited units guide covering free Souls, trait rerolls, squad roles, and stage-by-stage progression.
Undertale Adventures X Update Schedule: Patches, Codes, and Progression
Understand the Undertale Adventures X update schedule, what patches change, and how to time your Souls, rerolls, and units for maximum progress.
Undertale Adventures X: The Fastest Way to Evolve Units (2026 Guide)
The Undertale Adventures X fastest way to evolve units: plan duplicates, farm Souls, and reroll traits in one repeatable progression routine.
Undertale Adventures X Beginner Guide: Early Game Units, Traits & Farming Tips
A complete Undertale Adventures X beginner guide covering first deployments, upgrades, farming routes, traits, and summoning plans for Roblox players.
Undertale Adventures X How to Beat Hard Mode: Placement, Traits, and Upgrade Guide
Struggling with Undertale Adventures X hard mode? Learn upgrade priority, path placement, role-appropriate traits, and a farming loop.
Undertale Adventures X Meta Team Guide: Best Units, Traits, and Tower Defense Strategy
A practical Undertale Adventures X meta team guide: roles, trait rerolls, resource spending, and free codes to build a squad that clears chapters.
Undertale Adventures X Tutorial: Beginner Guide to Units, Traits, and Codes
A complete Undertale Adventures X tutorial covering your first match, the four combat roles, trait rerolls, codes, and progression systems.
Undertale Adventures X: How to Beat Last Corridor — Full Strategy Guide
Learn how to beat the Last Corridor in Undertale Adventures X with the right team comp, traits, upgrade order, and placement tips that stop leaks.
Undertale Adventures X: How to Beat Neutral Corridor Act 1 (Full Team & Strategy Guide)
Learn how to beat Neutral Corridor Act 1 in Undertale Adventures X with Mettaton NEO leader buffs, Knight Knight DPS, Woshua soak, and leak control.
Undertale Adventures X: How to Evo Summon Mythic Units (2026 Guide)
Learn how to evo summon mythic units in Undertale Adventures X — requirements, evolution steps, Souls, rerolls, and the mistakes that stall your first mythic.
Undertale Adventures X: How to Get Evolve Items (Complete 2026 Guide)
Learn how to get evolve items in Undertale Adventures X, from story chapter drops and raid rewards to codes and trading, plus fast farming routes.
Undertale Adventures X All Units: Roster Guide, Roles, and Team Building
A full guide to Undertale Adventures X all units: how summoning works, which roles to prioritize, and how to build a team that clears every chapter.
Undertale Adventures X Core Sans Evolution: Full Unit Guide, Traits, and Placement Tips
Undertale Adventures X Core Sans evolution explained: upgrade scaling, trait picks, placements, and mode-by-mode performance.
Undertale Adventures X Corridor Dust Sans Guide: Stats, Drops, and Team Synergy
A complete Undertale Adventures X Corridor Dust Sans guide: unlock steps, Blood typing, stacking passives, leader skill rules, and team synergy.
Undertale Adventures X Delta Sans Evolution: Full Unit Guide & Showcase Tips
A complete Undertale Adventures X Delta Sans evolution breakdown: unit role, placement, trait picks, mode value, and investment tips for Sans players.
Undertale Adventures X Dustdust Showcase: Corridor Dust Sans Unit Guide
A full Undertale Adventures X dustdust showcase breakdown: how to unlock Corridor Dust Sans, his two-move kit, leader skill, and best team synergy.
Undertale Adventures X Sans Showcase: Stats, Traits & Best Builds
A full Undertale Adventures X Sans showcase: stats, traits, placement tips, team synergy, and progression advice for the game's top S-tier unit.
Undertale Adventures X Swap Papyrus Showcase: Unit Guide, Team Builds & Trait Tips
Plan an Undertale Adventures X Swap Papyrus showcase with role tips, placement maps, trait priorities, and a recording checklist for tower defense runs.
Undertale Adventures X: Possession Sans, Overgrowth Rumors & Meta Units Explained
Undertale Adventures X guide: possession Sans and Overgrowth terms explained, plus the S-tier meta lineup, traits, Raids tokens, and AFK Chamber tips.
Undertale Adventures X Battlepass Towers: Progression and Defense Guide
A mechanics deep dive into Undertale Adventures X battlepass towers, covering progression, tower roles, rewards, and tips for clearing chapters faster.
Undertale Adventures X Best Starter Units: Early-Game Team Guide for New Players
New to this Roblox tower defense? Learn how to pick the Undertale Adventures X best starter units, balance team roles, and roll traits that carry you.
Undertale Adventures X Evolution Guide: How to Evolve Units and Farm Souls Fast
A complete Undertale Adventures X evolution guide covering Souls, Soul Fragments, trait rerolls, unit priorities, and free rewards to speed up your upgrades.
Undertale Adventures X Limited Units: Unlock, Summon, and Build Guide
Learn how Undertale Adventures X limited units work, where to get them, how to budget Souls, and how to build a team that clears chapters first try.
Undertale Adventures X Shiny Units: Traits, Odds, and Farming Guide
Learn how Undertale Adventures X shiny units work, how traits and levels stack, and the fastest farming routine for building a shiny-ready team.
Undertale Adventures X Summon Guide: Souls, Units, and Rerolls Explained
This Undertale Adventures X summon guide covers Soul Fragments, unit summoning, trait rerolls, and the codes that fund your tower defense squad.
Undertale Adventures X Unit Tier List: S to B Ranks and Roles Explained
A community-built Undertale Adventures X unit tier list covering Sans, Asriel, Mettaton NEO, and more, with roles, substitutes, and team tips.
Undertale Adventures X Corridor Guide: Neutral Corridor Act 1 Walkthrough
Beat Neutral Corridor Act 1 with this Undertale Adventures X corridor guide covering Mettaton NEO's leader buff, Knight Knight DPS, and Woshua soak.
Undertale Adventures X Endless Mode: A Survival Guide for Long Runs
Learn how endless mode works in Undertale Adventures X: wave scaling, unit traits, team comps, and tips to push your tower defense runs deeper.
Undertale Adventures X Hotland Act 6 Genocide: Modes, Regions, and Farm Guide
A practical guide to Undertale Adventures X Hotland, Act 6, and Genocide mode: region order, unit rosters, kill grinds, and how to pick the right act.
Undertale Adventures X Raid Act 1 Guide: Best Teams, Rewards, and Clear Tips
A practical walkthrough of the Undertale Adventures X Raid Act 1 mode, covering prep, unit roles, strategy, rewards, and the codes worth redeeming.
Undertale Adventures X Raid Act 2 Guide: Team Setup, Unlock Steps, and Clear Strategy
A practical Undertale Adventures X Raid Act 2 guide covering unlock conditions, team roles, unit placement, upgrade order, and reward planning tips.
Undertale Adventures X Raid Act 3: Mode Guide, Units & Token Tips
Undertale Adventures X Raid Act 3 explained: how the raid acts work, the best units and traits for a clean clear, and how to farm Tokens faster.
Undertale Adventures X Snowdin Act 6 Genocide: Full Mode Guide and Strategy
Master the Undertale Adventures X Snowdin Act 6 Genocide mode with unlock steps, unit picks, wave tactics, and reward tips in this full guide.
Undertale Adventures X Codes (October 2026): Free Souls and Rerolls
All active Undertale Adventures X codes for October 2026, plus how to redeem them for Souls, Trait Rerolls, and Gaster Hands in Roblox.
Undertale Adventures X Best Team Guide: Roles, Traits, and Progression
Build the Undertale Adventures X best team with role-based lineups, trait priorities, and stage-by-stage progression tips for this Roblox tower defense.
Undertale Adventures X No Limited Units Guide: Clear It Without Banners
A complete Undertale Adventures X no limited units guide covering free Souls, trait rerolls, squad roles, and stage-by-stage progression.
Undertale Adventures X Update Schedule: Patches, Codes, and Progression
Understand the Undertale Adventures X update schedule, what patches change, and how to time your Souls, rerolls, and units for maximum progress.
Undertale Adventures X: The Fastest Way to Evolve Units (2026 Guide)
The Undertale Adventures X fastest way to evolve units: plan duplicates, farm Souls, and reroll traits in one repeatable progression routine.
What is Undertale Adventures X?
Undertale Adventures X is a Roblox tower defense game from Side Productions that rebuilds the Underground and its cast as deployable units. You place characters along a lane, they attack incoming monster waves automatically, and you spend in-match currency to upgrade them before enemies reach your base.
Between runs you collect permanent resources, summon new units with Souls, evolve them into stronger forms, and reroll traits to raise their ceiling. Our wiki covers every system with codes, unit tier lists, evolution breakdowns, and step-by-step progression guides.
Explore All GuidesDeveloper
Side Productions
Platform
Roblox
Genre
Tower Defense
Released
Jul 16, 2024
Total Visits
17.7M+
Server Size
15 Players
Positive Rating
93%
Explore Undertale Adventures X Wiki
Dive into Undertale Adventures X with working codes, a unit tier list, evolution and trait guides, beginner walkthroughs, and progression tips for this Roblox tower defense game.
Undertale Adventures X Codes
Redeem the latest working codes for free Souls, Trait Rerolls, and Gaster Hands, and learn how to claim them before they expire.
MOREFREESTUFF25x Trait Rerolls, 3 Gaster Hands, 1,000x SoulsGaster HandsRare bonus item bundled with the code, so check your inventory after redeemingRedeemOpen the Codes button in the main lobby, enter the code, then confirm to claimUndertale Adventures X Tier List
Unit rankings by the job each character fills, from area damage and boss killing to crowd control and front-line survival.
Sans, Asriel, Mettaton NEO, Undyne the Undying, Papyrus - top band for their role
Asgore, Muffet, Mettaton EX - the named backups when an S-tier pick is missing
Temmie and Greater Dog - early and situational picks with a defined window
Starter and role-filler coverage that clears the opening acts, then rotates out
Undertale Adventures X Beginner Guide
A step-by-step early-game walkthrough covering deployment, upgrades, farming routes, traits, and summoning priorities.
Undertale Adventures X Best Units
Notable units compared by damage potential, combat role, and how well they fit a balanced Undertale Adventures X team.
Undertale Adventures X Traits Guide
How unit traits and rerolls raise a unit's ceiling, which traits to keep for each role, and how to spend rare rerolls without waste.
Undertale Adventures X Units and Characters
A browsable look at the playable Undertale-inspired roster, with the role and acquisition notes for each character.
Undertale Adventures X Game Modes
The main story chapters, Raids, Corridor, Endless, and Genocide acts explained so you can pick content that fits your current team.
Undertale Adventures X Progression Guide
How to strengthen your roster through leveling, Souls, evolution, and sensible upgrade priorities without wasting rare materials.
Frequently Asked Questions
Quick answers to the most common questions about Undertale Adventures X.
Ready to Master Undertale Adventures X?
From your first wave of monsters to late-game boss stages, our community wiki has you covered with free, up-to-date codes, unit tier lists, and progression guides.