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Zenless Zone Zero Zenless Zone Zero
ZZZ INVESTIGATION LICENSE LEVELING
$1.19
4,8/5 Trustpilot Based on 52044 reviews
SSLSSL USETooltip Kingboost ensures secure and private transfer of the data within our system by encrypting every bit of your information. The sensitive data that you share with us is protected by SSL protocol.
VPNVPN USETooltip Even with piloted orders, your account remains completely safe. All of our boosters are thoroughly checked and will use your personal VPN server to guarantee your account stays unharmed.
Support24/7 SupportTooltip Our experienced support team is available at any time to assist you, handling everything from order recommendations to post-completion requests.
PilotedPilotedTooltip The fastest and most effortless way to complete your order. By allowing our booster to access your account, you save time while we handle the boost for you.
CheapFound cheaper? We price matchTooltip Found cheaper? We price match - If you find a better offer on another website, contact our support team - we'll beat the price and make sure you get the best deal.

Level your Investigation License. Unlock Withered Crystals, Resonia, and Hollow Zero rewards

The Investigation License is Hollow Zero's progression system. Each level gives Withered Crystals for shop purchases and unlocks new Resonia for stronger runs. Higher levels also grant permanent damage bonuses and more starting options. Grinding license XP means repeating Hollow Zero zones — same layout, same enemies, same burn. Our boosters skip the burn.

We level your Investigation License to your desired rank. All level rewards — Withered Crystals, Resonia, upgrade mats — collected. Qualification Assessment Zone cleared if needed. No Hollow Zero repetition.

YOU WILL GET

  • Desired Investigation License level reached
  • Withered Crystals for Hollow Zero shop
  • New Resonia unlocked for stronger runs
  • Permanent damage bonuses and starting options
  • All level rewards collected
REQUIREMENTS
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  • Active ZZZ account
  • Qualification Assessment Zone cleared
WHY KINGBOOST
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50,000+ players trust us. That number isn't luck—it's the result of years of consistent delivery, professional boosters and a support team that cares about your experience.

Here's what makes us the best at what we do:

  • Experienced boosters who know their stuff. Our team consists of players who've mastered every aspect of the game. They know the fastest routes, the most efficient strategies and every optimization technique that turns a challenging task into a perfectly smooth experience. You're not getting help from casual players, you're working with veterans who've proven themselves thousands of times.
  • Your account's safety is non-negotiable. VPN matched to your location. Play schedules that align with your hours. Zero sketchy behavior that could flag your account. We've completed thousands of orders and we know exactly how to keep you safe.
  • Price match guarantee. Found the exact same service cheaper elsewhere? Make your order and contact us - we'll match it.
  • 24/7 support. Questions before you buy? Mid-boost concerns? Our LiveChat team is available around the clock. Real people, real answers, no waiting.
  • Completion guarantee. Game crashes, unexpected delays, technical issues—whatever happens, we make it right. You're paying for results and that's what you'll get.
  • Still not sure? Check our Trustpilot reviews and see what real players are saying. Or reach out to us directly, we're happy to answer any questions before you commit.
HOW THIS BOOST WORKS
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  • If you have any questions about the chosen service, reach out to us via LiveChat. Our operators will be happy to assist you.

  • Place your order with all necessary options selected.

  • Once we receive your order, we’ll contact you on Discord to confirm details, such as your preferred start time.

  • If you selected the Piloted boost method:

    • Our professional booster will play on your account following all possible safety measures (e.g., VPN) according to the agreed schedule.

    • Please avoid logging into your account while the boost is in progress. If you’d like an update, feel free to message your booster directly on Discord or contact our support via LiveChat.

  • If you selected the Selfplay (Remote) boost method:

    • We’ll ask you to install Parsec — a trusted and widely used program we work with for this method.

    • Our booster will connect remotely to your PC and complete the boost according to the set schedule.

    • While this method may seem a bit more technical, it offers the highest possible level of safety.

  • Once the order is complete, we’ll notify you, then you’ll be free to log in and enjoy the results. 

  • We will highly appreciate it if you leave a review on our Trustpilot page!

Start time

Up to 15 Minutes

Completion time

Flexible
Customize Your Order
Your Current and Desired Level: (1-10)
Additional Options
Start Priority & Completion Speed:?Optional upgrade for faster order start and completion — pick the speed that fits your needs!
Total $1.19
cashback Cashback
$0.04

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Events

Reviews on ZZZ INVESTIGATION LICENSE LEVELING
5
(201 Reviews)
  • 5 stars 201
  • 4 stars 0
  • 3 stars 0
  • 2 stars 0
  • 1 star 0
MO
Marek Olbrys
06/07/2026
5

I couldn't be happier with the service

I couldn't be happier with the service! Every order has been handled quickly, professionally, and exactly as promised. The communication is excellent, the team is reliable, and the entire process is smooth from start to finish.

What impressed me the most is their consistency. Every time I use their service, I receive the same high level of professionalism and customer care. It's clear that they genuinely value their customers and strive to provide the best possible experience.

I highly recommend this company to anyone looking for a trustworthy, fast, and reliable service. They have definitely earned my 5-star rating, and I will continue using their services with complete confidence. Thank you for another outstanding experience!

PW
Patrick Wolf
19/06/2026
5

Boost for CoD Event

This was the first time I had ever used a boosting service. I looked at many different websites, and the prices here are truly unbeatable—so much so that it almost seemed like a scam.

However, after placing my order, I was assigned a booster very quickly. There were a few minor issues along the way, some on the booster’s side and some on my side, but customer support took care of everything. In the end, I received exactly what I had ordered.

I would especially like to praise the customer support team once again. They provided excellent and highly professional service throughout the entire process.
I would definitely use Kingboost services again in the future and would gladly recommend them to others.

Total 

$1.19

cashback Cashback
$0.04