Since its launch, Zenless Zone Zero has challenged countless Proxies with ever-deeper Hollows and fiercer foes. Yet even the most stylish squad will struggle without true power—the kind that comes only with experience points (EXP) and strategic leveling. In 2026, the race to max out Agents at level 60 remains one of the game’s most resource-intensive pursuits. How, then, can players efficiently transform a ragtag crew into an elite force capable of dominating the toughest commissions?
First, let's clarify what EXP means in ZZZ. It refers to the experience points required to raise an Agent’s level. While story quests, commissions, and Hollow exploration grant some EXP, the primary way to push characters to the max is by using special materials called Investigator Logs. These come in three tiers: Trainee Investigator Log (least rare), Official Investigator Log, and Senior Investigator Log (most rare and potent). The difference in value between them is staggering, and wise Proxies know that hoarding Senior Logs is the key to late-game progression.
What exactly does it take to hit the cap? According to community data painstakingly gathered over the years, leveling a single Agent from 1 to 60 demands a staggering total of roughly 900,000 EXP points. That translates to approximately 300 Senior Investigator Logs—or an even more daunting pile of lower-tier materials. Naturally, the cost per level spikes dramatically after level 40, making every resource decision weighty. Should you spread your precious logs across your entire roster? Absolutely not. The smart move is to funnel the bulk of your investment into Agents that define your core combat loop.
But which roles deserve priority? In almost every team composition, three archetypes stand out as the backbone of success. Your Damage per Second (DPS) dealers need the levels to hit hard enough against time-limited challenges. Your Stun characters, who control and break enemies, must survive and deliver impactful stuns. And your Support units, who buff and heal, require survivability to keep the team alive during drawn-out Hollow invasions. Spreading resources thinly across everyone else before these pillars are at level 60 is a recipe for mediocrity.
So, where does one find the massive quantity of Investigator Logs needed? The answer lies within the Hollow Investigative Association Club, better known as the HIA Club. This facility unlocks naturally after completing the “Cat’s Lost and Found” main story commission, which becomes available once you finish the Chapter 1 Intermission. Once unlocked, simply fast travel to the HIA Club and speak with Bertha. She is the gatekeeper to the game’s most reliable EXP goldmine: Combat Simulation.
Combat Simulation is a virtual reality training room where Proxies can customize their opponents. The real farming magic happens when you deliberately select enemies that have a chance to drop Senior Investigator Logs. By checking the enemy info panel, you can see potential drops—though nothing is ever guaranteed. This is where the question of difficulty comes in: is it better to steamroll the easiest tier and hope for quantity, or to push higher for quality? The answer is almost always to find that sweet spot where you can still comfortably clear the fight while maximizing the drop rate for Senior Logs. Higher difficulties not only boost drop chances but also sometimes reward extra logs of better rarities, making them far more stamina-efficient in the long run.
For those wondering about the daily routine, veterans in 2026 agree that dedicating a chunk of your daily Battery Charge (the game’s stamina system) to targeted Combat Simulation runs is the most consistent path. Pair this with event rewards and occasional log handouts from the Outpost, and you’ll see your key Agents steadily climb toward 60. However, patience is vital; try to avoid the temptation to mindlessly farm the first node you see. Always ask yourself: “Is this enemy dropping what my team actually needs?”
Beyond pure EXP, remember that reaching level 60 also unlocks the full potential for core skill upgrades and agent-specific talents, which themselves require a slew of other materials. Therefore, a balanced approach—farming logs while keeping an eye on passive talent materials—will serve you best in the long term. For instance, the video store’s film collection and trust events can yield side bonuses, but they are secondary to the HIA Club’s output.
To sum up, the road to level 60 in Zenless Zone Zero is a marathon, not a sprint. Prioritize your team’s cornerstone roles, invest heavily in DPS, Stun, and Support Agents, and turn the HIA Club’s Combat Simulation into your daily ritual. With the right focus and a little patience, your squad will stand ready to face whatever the Hollows throw at you in 2026 and beyond.
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