Update 4.0 is the latest major patch for Universal Tower Defense Z, bringing new units, balance changes, and meta shifts that affect every team composition. This guide covers all the changes, how they impact the current meta, and what you should do to adapt your team.
Update 4.0 Overview
Update 4.0 is a significant content and balance patch that reshapes the UTDZ meta:
| Category | Changes | Impact Level |
|---|---|---|
| New Units | Summer event units + Spider-verse collab | High — new S-tier additions |
| Balance | DPS adjustments across multiple units | Medium — tier list shifts |
| Traits | New trait interactions | Low — minor optimization |
| Modes | Summer event mode + Raid changes | Medium — new farming |
| Bug Fixes | Various combat and UI fixes | Low — quality of life |
New Units in Update 4.0
Update 4.0 introduces several new units, including limited summer event units:
| Unit | Role | Tier | Rarity | How to Get | Limited? |
|---|---|---|---|---|---|
| Summer Joyful Captain | Hybrid DPS | S | Mythic | Summer event banner | Yes — event only |
| Spider-Verse Unit | Ground DPS | A | Legendary | Collab banner | Yes — limited |
| Smash Unit | Hill DPS | A | Legendary | Collab banner | Yes — limited |
The Summer Joyful Captain variant is particularly noteworthy as a limited S-tier Hybrid DPS — it may not return after the event ends.
Balance Changes and Meta Shifts
Unit Tier Changes
| Unit | Pre-4.0 Tier | Post-4.0 Tier | Change | Reason |
|---|---|---|---|---|
| Joyful Captain | S | S (unchanged) | — | Still the best overall Hybrid |
| Ancient Mage | S | S (unchanged) | — | Top Hill unit remains dominant |
| Pirate King | S | S (unchanged) | — | Best Ground DPS unchanged |
| Super Roku | A | A+ | ▲ Minor buff | SPA reduction improves DPS |
| Ultiorra | A | A (unchanged) | — | Still strong Hill specialist |
| Shunks | A | A (unchanged) | — | AoE Ground remains niche |
| Zora | B | B | — | Reliable mid-game Hybrid |
DPS Adjustments
| Change | Details | Impact |
|---|---|---|
| SPA reduction for A-tier units | -5% to -10% SPA | Moderate DPS increase for A-tier |
| Boss HP scaling adjustment | Raid bosses have less HP | Easier Raid clears across difficulties |
| Farm unit income buff | +5% base income | Better Gem economy |
New Codes for Update 4.0
Several new codes were released with Update 4.0:
| Code | Reward | Status | Source |
|---|---|---|---|
| Summer2026! | 50 Trait Rerolls + 10K Summer Currency | Active | Summer event launch |
| SrryForWhoopsie! | 1 Ruler Ticket | Active | Developer apology |
| SpectacularSpider! | 50 Trait Rerolls + 100K Universal Gems S1P1 | Active | Spider-verse collab |
| TheGuyFromSmash! | 50 Trait Rerolls + 100K Universal Gems S1P2 | Active | Smash collab |
Check our codes page for the complete list of active and expired codes.
Summer Event Mode
Update 4.0 introduces a limited-time Summer Event mode:
| Feature | Details |
|---|---|
| Duration | Limited (check in-game) |
| Currency | Summer Currency |
| Rewards | Summer Joyful Captain banner, cosmetics, bonus Gems |
| Difficulty | Normal and Hard variants |
| Co-Op | Supported (up to 12 players) |
Summer Event Rewards
| Reward | Cost (Summer Currency) | Value |
|---|---|---|
| Summer Joyful Captain (guaranteed) | 10,000 | S-tier limited unit |
| Summer cosmetic pack | 5,000 | Cosmetics only |
| Bonus Gems (10K) | 2,000 | Standard value |
| Trait Rerolls (100) | 1,000 | High value |
What to Do After Update 4.0
Immediate Actions
- Redeem all new codes — Check the codes page for Summer and collab codes.
- Evaluate new units — Determine if Summer Joyful Captain fits your team.
- Check tier list — Meta may have shifted; review unit rankings.
- Run Summer Event — Farm Summer Currency for limited rewards before the event ends.
- Reroll A-tier units — SPA buffs may change your trait priority.
Long-Term Adjustments
| Change | Action | Timeline |
|---|---|---|
| New S-tier Hybrid available | Consider pulling if you need a Hybrid DPS | During summer event |
| A-tier DPS SPA buff | Slightly higher value for A-tier units | Immediate (automatic) |
| Farm income buff | Farm units are more valuable — invest in Fortunate | Next reroll session |
| Raid boss HP reduction | Easier Exclusive and Secret shard farming | Next Raid session |
Raid Changes in Update 4.0
Raid bosses received a difficulty adjustment:
| Raid Tier | HP Change | Drop Rate Change | New Best Strategy |
|---|---|---|---|
| Normal | -10% | Unchanged | Same strategy, easier clear |
| Hard | -15% | +5% Exclusive | More accessible for mid-game |
| Nightmare | -10% | +10% Secret | Slightly easier Secret shard farming |
The reduced boss HP makes Nightmare Raids more accessible for teams that were close but not quite strong enough pre-4.0. See our game modes guide for updated Raid strategies.
Advanced Tips for Experienced Players
Once you have mastered the basics, these advanced strategies will help you optimize every aspect of your UTDZ gameplay:
Daily Optimization Checklist
| Time | Activity | Expected Reward | Time Investment |
|---|---|---|---|
| Login | Redeem any new codes | 10-200K+ Gems | 1 minute |
| Morning | Complete 3 Daily Quests | 30K Gems + 50 Rerolls | 15 minutes |
| Morning | Run 3 Challenges | 50K Gems + 100 Rerolls | 20 minutes |
| Midday | Farm Story Mode | 300K+ Gems per hour | 1+ hour |
| Evening | Run Raids (if available) | Shards + Relics | 30-45 min |
| Overnight | Set up AFK Infinite Mode | 80K+ Gems per hour | 5 minutes to set up |
Resource Management Framework
| Resource | Daily Income | Weekly Income | Recommended Reserve | Spending Rule |
|---|---|---|---|---|
| Gems | 500K+ | 3.5M+ | 5000+ (for featured banner) | Save for pity, spend on Evolution |
| Trait Rerolls | 150+ | 1050+ | 500+ (for trait chase) | Fortunate first, then chase best trait |
| Mythic Shards | 3-5 | 21-35 | Always spend on S-tier | Etherealize primary DPS first |
| Exclusive Shards | 0-1 | 3-6 | Save until 5 | Only spend on primary S-tier |
| Secret Shards | 0 | 1-2 | Never spend frivolously | Primary S-tier only |
| Stat Locks | 0-1 | 2-5 | 5+ | Only use on BiS relics |
Weekly Planning Template
| Day | Focus | Secondary | Gems Target |
|---|---|---|---|
| Monday | Daily Quests + Challenges | Story Mode farming | 500K |
| Tuesday | Daily Quests + Raid day | Evolution material farming | 400K |
| Wednesday | Daily Quests + Story farming | Trait Reroll farming | 600K |
| Thursday | Daily Quests + Challenges | Relic farming (Raids) | 500K |
| Friday | Daily Quests + Raid day | Featured banner pulls if available | 400K |
| Saturday | Intensive Story Mode farming | AFK setup for overnight | 1M+ |
| Sunday | Weekly Quests + Review | Plan next week, check codes | 500K+ |
Common Mistakes to Avoid
| Mistake | Impact | Fix | Prevention |
|---|---|---|---|
| Spreading shards across multiple units | No unit reaches full power | Concentrate on primary DPS first | Follow etherealization priority order |
| Rerolling DPS traits before Farm Fortunate | Missing 20% income for weeks/months | Always get Fortunate first | Roll Farm trait before DPS |
| Spending Gems on standard banner | No pity guarantee | Save for featured banner only | Track featured banner schedule |
| Skipping daily quests | 30K+ Gems + 50 Rerolls lost per day | Do all 3 daily quests every day | Set a daily alarm or routine |
| Over-investing in B-tier units | Wasted resources that should go to S-tier | Minimal investment only | Stop at Evolution 1 for B-tier |
| Not joining co-op Raids | Missing Exclusive/Secret shards | Join Raid groups via Discord | Schedule weekly Raid sessions |
| Forgetting to AFK farm | 80K+ Gems/hour lost overnight | Set up AFK before sleeping | Make it part of bedtime routine |
Frequently Asked Questions
Will the Summer Joyful Captain return after the event? Limited units typically do not return. If you want a Summer variant, pull during the event. The standard Joyful Captain remains available on regular banners.
Do I need to update my team after 4.0? If your team was already S-tier, no major changes are needed. A-tier units got minor buffs that may affect niche team compositions. Check the tier list for current rankings.
What is the most important thing to do in Update 4.0? Redeem the new codes immediately, then farm the Summer Event for limited rewards. The Summer Joyful Captain is a limited S-tier unit that may not return.
Are there any new traits in 4.0? No new traits were added. Existing trait interactions were adjusted slightly, but the core trait system remains the same. See our traits guide for current roll probabilities and priority.