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Gem Farming Guide

Efficient methods to farm gems in Universal Tower Defense. Maximize your summons with smart resource management.

9 min readUpdated: Dec 2025

Gem Economy Overview

40 Gems
= 1 Summon
400 Pity
Guaranteed Mythic
0.5% Rate
Mythic chance
Generous
Gems are easy to get

Good news: UTD is fairly generous with gems. You can realistically get 100+ summons in your first few hours.

Active Redemption Codes

Use these codes for free gems! Enter them in the code redemption area.

release
Gems
thank you
Gems
unrivaled
Gems
40k CCU
Gems

Codes expire! Use them as soon as possible. Check community for new codes.

Gem Sources Ranked

S

Story Mode (1000% Difficulty)

~400 per Act15-25 min

Best early game source. With a strong unit like Ace, you can solo 1000% difficulty.

Requires: Strong Mythic unit
S

Level Milestones

100-500+ per levelPassive

Massive free gems just from leveling up. Also gives 10 rerolls per level.

Requires: Just play the game
S+

Redemption Codes

Varies (1000+)1 min

Free gems! Use codes: release, thank you, unrivaled, 40k CCU

Requires: None
A

Virtual Realm Hard

100020-30 min

Good gems plus exclusive gear. Requires strong Kyito team.

Requires: Kyito + Duelist, Fortune card
A

Achievements

50-500 eachVaries

Many easy achievements give good gems. Check regularly.

Requires: Various
A

Unit Index (Collection)

500 per MythicN/A

First time unlocking each Mythic gives 500 gems.

Requires: Pull new Mythics
B

Daily/Half-hour Challenges

50-10010-15 min

Good for rerolls and materials, gems are bonus.

Requires: Decent team
B

Group Rewards

100+1 min

Hidden box near Play area. Join Roblox group + like game.

Requires: None
B

AFK Chamber

Based on best timePassive

Set and forget. Generates rewards based on your best clear times.

Requires: Good clear times

Story Mode Gem Farming

Standard Method (75%)

  • Safe and consistent
  • Works with any team
  • Good gem rewards

Speedrun Method (1000%)

  • ~400 gems per Act
  • Requires strong Mythic (Ace works)
  • Higher relic drop rates (14.5%)

Daily Gem Checklist

Clear Gold Shop
Buy ALL Trait Rerolls and Fragments
High
Claim Daily Quests
Easy gems and materials
High
Run Half-hour Challenges
3 rerolls + evolution materials each
High
Check Level Milestones
Claim after leveling up
High
Check Achievements
Many give gems passively
Medium
Set AFK Chamber
Passive resource generation
Medium

Gold Shop (Ramen Guy)

Don't Forget the Gold Shop!

Located near the spawn point. Uses Gold (not gems) to buy valuable items.

  • • Trait Rerolls - Buy ALL of them daily
  • • Rainbow Fragments - Evolution materials
  • • Burning/Ocean Fragments - Hard to farm otherwise

Gold is abundant - you'll have 100k+ eventually. Don't hesitate to clear the shop.

Gem Spending Priority

1

Banner Summons

Pull for Kenpachi, Ace, Kyito, Virtual Idol

2

Speed Cart Copies

Keep pulling until you have enough for E6

3

Mythic Duplicates

For Etherealization of your main carries

Common Mistakes

  • Skipping Gold Shop

    Rerolls are limited. Buy them every single day.

  • Ignoring Level Milestones

    Thousands of gems sitting unclaimed. Check after every level.

  • Playing at 100% when struggling

    Use 75% difficulty until you have strong units. Failing wastes time.

  • Missing Group Rewards

    Hidden box near Play area. Easy free gems, often overlooked.

Gem Farming Progression

1

Day 1

Use ALL codes → Pull until you get Speed Cart + Mythic DPS → Clear Story Acts 1-6

2

Week 1

Claim Level Milestones → Clear Story on higher difficulty → Farm Half-hour Challenges

3

Endgame

Virtual Realm Hard for 1000 gems → Featured Challenge for rerolls → Achievements cleanup

Related Guides

UTD Beginner Guide
Getting started basics
Unit Upgrade Priority
What to spend gems on