Building a free-to-play team in Universal Tower Defense Z
How to think about a free-to-play team in Universal Tower Defense Z: role balance, the one Synchro Clash pair an independent guide confirms, and an honest account of which acquisition routes nobody publishes.
Last updated 2026-07-14 · By Jim Liu
What a free team is competing against
Be clear about the actual disadvantage before you plan around it.
Paying in a game like this rarely unlocks a mechanic. It buys attempts, and attempts buy breadth. So the free player is not short of power, they are short of rerolls, and a plan that assumes you can keep summoning until the meta unit lands is a plan written by someone who could.
Which flips the strategy. The paying player can afford a wide, shallow roster because they will eventually pull the missing piece. You cannot, so your roster has to be narrow and finished. Six slots, and at least one of them fully invested rather than six at level one.
The shape: one core, one support, four flexible
Not a fixed list of names, because a fixed list you cannot obtain is worthless.
There are 19 units at S+ on our tier list, and Update 4.0 alone added twenty-four or more units to the game, which tells you how fast the top of this roster turns over. Publishing a locked six-unit list against a roster that moves that quickly would be a page we would have to quietly rewrite every patch, so here is the shape instead.
- One damage core. The best damage unit you own, levelled, and the first unit you spend shards on. Not the best unit on the tier list. The best one in your inventory.
- One support, if you have one. Support is scarce at the top of this roster, which raises the value of any support you already own.
- Four flexible. Fill these with whatever covers the stage in front of you. They change more often than the first two, and that is the point of them.
Synchro changes which units are worth keeping
7 sourced pairings, four conditions, and three kinds that are not interchangeable.
Synchro pairs two specific units, and the Clash shipped in Update 2.5 rather than in 4.0 — a detail worth getting right, because a mechanic people think is brand new is a mechanic they assume nobody has documented. Deltia's Gaming and Pro Game Guides both have.
Pro Game Guides names three kinds. A Synchro Clash and a Synchro Drive leave both units on the board, firing together while nothing is consumed. A Merge turns the two into one unit, which is a trade rather than a bonus. There is no "Fuse" — that word was ours, and it went out with the six merge-result names this site used to print, none of which appear in any source. Between the two outlets there are 2 Clashes, 2 Drives and 3 Merges. The four conditions for a Clash, which both outlets state:
- Both units must be placed on the same field.
- They must be within each other’s attack range.
- Both must be fully upgraded, or at least upgraded equally.
- The clash then fires automatically, with no button to press.
Two Clashes come with numbers. Mimicry Sorcerer (Cursed Love) + Jane Juliet (Larper), per Deltia's Gaming: 500% of the average damage between the two units, on a 60 seconds cooldown, as a Water (Ground) attack. Pirate King (Voyage) + Quake Warlord (Destroyer), per Pro Game Guides: hits the entire map for massive averaged damage, on a 300 seconds cooldown. For a six-slot team built on scarcity, that is free damage on two units you were fielding anyway, which is the strongest argument a free roster ever gets.
The 2 Drives, which Pro Game Guides names without publishing figures for, are Revolutionary Chief (Emperor) and Spade (Donut); Nutaru (Beast) and Ancient Shinobi (Reawakened). The 3 Merges are Human Spider (Responsible) and Symbiotic Alien (Apex); Human Spider (Responsible) and Iron Billionaire (Genius); Super Goku (Third Ascension) and Limit Breaker Prince (Marked) — and of those, only Super Goku (Third Ascension) and Limit Breaker Prince (Marked) has its result named, as Vegito Super. Pro Game Guides adds the line that matters for the other two: both inherit Human Spider's Trait and stats, so his build drives their damage.
Not verified yet. Damage numbers exist for the two Clashes above and nowhere else. No source publishes figures for a Drive or a Merge, so any number you see attached to one, on any site, has nothing behind it. Nor does any source name the unit that 2 of the 3 Merges produce.
The support slot is the hard one
And it is the slot free players skip, which is why their teams stall.
Of the 19 units at S+, our roster data tags 0 as support. Everything else at the top of the list is damage in one form or another. That ratio is the argument.
The mistake free players make is treating support as the thing you add once the damage is finished. In practice it is the thing that lets an underlevelled damage core survive long enough to matter, which is exactly the situation a free roster is always in.
Not verified yet. No source publishes per-unit output numbers for supports, so treat the role tags as a map of what a unit is for, not as a ranking of how well it does it.
What we cannot tell you yet
The section every other free-to-play guide leaves out.
A free-to-play guide is only as good as its acquisition routes, and ours are incomplete. We can source tiers and roles from Pro Game Guides, cross-checked against Destructoid, and the Clash rules from Deltia's Gaming. What no source states, for most of the roster, is whether a unit comes from a standard summon, an event extraction, a mode gate or an evolution chain.
That is a real limitation and it changes what you should do with this page. Use it for the shape of a team and for the confirmed pair. Do not use it as a shopping list, because a shopping list where half the prices are missing is worse than no list at all. A unit page gets an acquisition section the moment a source we can name states one, and until then it says plainly that nobody has.