How to Unlock All Universal Tower Defense Z Update 4 New Units

If you are diving back into the game, the Universal Tower Defense Z update 4 new units have completely shifted the current meta. With a massive roster expansion, players are scrambling to figure out how to unlock all the Universal Tower Defense Z update 4 new units before the next major patch drops. This massive patch is widely considered one of the biggest content drops in the game's history, introducing a staggering 25 characters to collect, upgrade, and deploy.

From secret characters hidden behind grueling raid bosses to exclusive summer event pulls and rare mythic banners, there is a lot of ground to cover. Whether you are hunting for anime-inspired titans or Marvel-themed defenders, this guide breaks down exactly where and how to farm every single addition to the roster.

Overview of the Roster Expansion

The sheer volume of the Universal Tower Defense Z update 4 new units can be overwhelming for both beginners and veterans. The developers have spread these characters across various game modes, including the Beast Desert, Reaper City Raids, and the newly introduced Extractions mode.

Based on community reports and early player experience, the grind to acquire all 25 characters requires a mix of luck, strategy, and persistence. You will need to tackle specific stages, participate in seasonal events, and save up your in-game currency for banner pulls.

Here is a quick breakdown of the character rarities introduced in this massive patch:

How to Unlock Secret Units

Secret units are some of the most sought-after defenders in the game. To get your hands on these powerful Universal Tower Defense Z update 4 new units, you will need to clear specific end-game content.

First on the list is Drill Hero Spiral. To unlock this character, you must complete Act Three of the Beast Desert stages. It requires a solid team composition to beat the final wave, but the reward is well worth the effort. Next is Ice Queen Evo. Unlike other characters, she is obtained through evolution. You must pull Rukia (White Haze) from the banner and evolve her using specific materials.

For players looking for heavy hitters, Flame Captain Embers (heavily inspired by Yamamoto) can be farmed from the Reaper City Raid. Community reports suggest he drops from the final stage of this raid. Meanwhile, Light Prince Ascension is tied to the Hollow Destroyer vs Reapers game mode. Finally, the true king of the update, Yuhabach, is locked behind the Universal Tear and Rift challenges.

Marvel-Inspired Extraction Mode Defenders

One of the most exciting additions to the game is the Extractions game mode, which introduces several superhero-themed characters. If you are a fan of web-slingers and billionaires in high-tech armor, you will want to spend a lot of time in this mode.

The Extractions mode features a unique drop rate system. The Human Spider (Spider-Man) is the easiest to obtain with a generous 95% drop rate. Iron Billionaire (Iron Man) sits at a 25% drop rate, making him slightly more difficult to farm. The rarest of the trio is the Symbiotic Alien (Venom), which has a strict 15% drop rate.

Additionally, players can unlock Trickster Phantom in the Expedition game mode. According to player experience, this character features an eight-run pity system, meaning you are guaranteed to unlock him after completing the mode eight times.

Summer Event and Mythic Banner Pulls

Seasonal events always bring top-tier rewards, and the current Summer Event is no exception. By playing the Summer Event game mode, players can earn special event currency. This currency is used to open Summer Capsules, which contain two highly coveted exclusive units: Ash & Valkyrie, and Asura & Wrath.

Beyond the seasonal festivities, the banner system has been updated with nine new Mythic units. Six of these are available directly from standard banner pulls, including heavy hitters like Body Captain, The Terror, and Cat Captain. Other notable mythics like Zombie Apostle (Corpse Maiden) and Fatality are also in the mix.

The crown jewel of the summoning area is the Unrivaled rarity unit, Visionary. While she technically counts as a Mythic for synergy purposes, her pull rate is an abysmal 0.005%. You will need incredible luck or a massive stockpile of gems to add her to your collection. For more information on navigating gacha mechanics safely, you can check out the official Roblox gaming platform guidelines on virtual economies.

The New Cosmetic System and Skin Crates

Alongside the Universal Tower Defense Z update 4 new units, the developers introduced a robust cosmetic system. Players can now customize their favorite defenders with unique skins obtained from various crates. There are currently 17 new skins available, ranging from student outfits to martial artist gear and legendary bunny suits.

You can access the skin UI by navigating to your units menu and selecting the skins tab. From there, you can purchase crates using either gems or Robux. Premium crates generally offer better drop rates for epic and legendary skins.

However, be prepared for a massive resource sink. Standard crates cost around 15,000 gems each. Many veteran players have reported spending upwards of 1.5 million gems just to secure legendary skins for characters like Bulma. While the Robux option exists for those who want to bypass the grind, free-to-play users can still earn enough gems through daily challenges and endless modes.

Frequently Asked Questions (FAQ)

How many Universal Tower Defense Z update 4 new units are there? There are exactly 25 new characters introduced in this patch. This includes 9 secret units, 9 mythics, 2 summer exclusives, 4 extraction-based characters, and 1 unrivaled summon.

What is the hardest character to get in this update? Visionary is by far the most difficult character to obtain. As an Unrivaled rarity character, she has a staggeringly low 0.005% pull rate from the summon area.

Do I have to spend real money to get the Universal Tower Defense Z update 4 new units? No, all characters can be obtained through free-to-play methods. While you can spend Robux on premium skin crates or to speed up your gem acquisition, every unit is farmable through gameplay, raids, and events.

Where do I find the Summer Event capsules? You can find the Summer Event capsules in the dedicated Summer Event game mode area. Playing these specific stages rewards you with summer currency, which you can then exchange for capsules containing exclusive characters.