Most content in Injustice: Gods Among Us Mobile waits for you. Survivor is there tomorrow. Multiplayer is there next season. Battles are there forever.
Challenge mode is not. It runs for a window, it awards a character you cannot reliably get anywhere else, and then it closes. That deadline changes how you should approach it entirely — and it is why challenges are the single most common place players spend premium currency badly.
This guide covers what actually decides whether you finish a challenge, how to tell on day one that you cannot, and why skipping one on purpose is sometimes the correct play.
What challenge mode actually is
A challenge is a limited-time run of fights, built around one character, that awards that character for completing enough of it. Partial completion generally pays partial rewards — shards, currency, gear — but the headline prize is the character, and that is what people turn up for.
Three properties make it different from everything else in the game:
It has a deadline. Every other resource problem in Injustice is solved by patience. This one is not.
It has entry requirements. Fights are gated — by character, by class, sometimes by star tier or promotion level. The specifics change from challenge to challenge, which is why the first thing to read is the gates, not the rewards.
It is a meaningful source of promotion material. Challenge rewards are one of the named routes for the shards that character promotion depends on, alongside Phantom Zone. That makes challenges relevant even when the featured character does not interest you at all.
That third point is badly underrated. Players skip challenges because they do not want the character, and miss that the shards were the better half of the prize.
Why challenges break the normal rules
Every other guide on this site tells you a version of the same thing: be patient, aim at one target, do not spread yourself thin. Challenges are the one place where patience is not on the menu, and that inverts several habits.
You cannot farm your way to eligibility mid-challenge. You cannot wait for a better week. You cannot decide two-thirds of the way through that you would rather have spent the resources elsewhere, because by then you already have.
So the useful skill here is not clearing fights. It is assessing, on day one, whether you can finish — and being willing to answer no.
The three things that decide it
1. Roster breadth, not roster power
This is the one that catches people out. Challenge gates ask who you own, not how strong they are. A narrow roster of heavily invested characters fails gates that a broad roster of mediocre ones strolls through.
If you have been following the standard advice — concentrate resources, depth over breadth — you will hit this wall eventually. That advice is still correct for progression generally. Challenges are the quiet exception that rewards having kept a wider bench than you strictly needed.
You cannot fix this during a challenge. You can only note which gates stopped you and let that inform what you hold on to next time. The best Injustice characters guide is about what makes a character worth investing in; challenge eligibility is a different question entirely, and occasionally the unremarkable character you nearly discarded is the only key you have — which is the whole argument of the duplicates guide.
2. Energy across the whole window, not today
Challenge fights consume Energy like everything else, and the total requirement is spread across the window rather than available in one sitting.
This is arithmetic, and it is worth doing before you start. Count the days remaining, be honest about how often you will actually check in, and compare that against what the challenge needs. A player who logs in twice a day for the whole window clears content that a player with more total playing time in fewer sessions cannot — because regeneration stops at the cap, and hours spent capped are income that never arrived.
The failure case is specific and extremely common. Someone starts on day one with a full tank, plays hard, spends everything they have, and then discovers on day six that the remaining fights need more attempts than the days left can generate. At that point the only route to finishing is paying for it — which is precisely the position the design is nudging you toward.
3. The Nth Metal you did not plan to spend
Refills and revives cost Nth Metal. Individually they are small. Across a challenge you are struggling with, they are not.
Here is what makes this the most expensive habit in the game: each individual purchase is rational in isolation. You are one fight from a tier. You have already put in five days. Buying the refill is obviously worth it right now. And it is — right up until you have spent a promotion's worth of premium currency on a challenge you still do not finish.
Before you start: the honest checklist
Run this on day one, not day five.
| Check | If the answer is no |
|---|---|
| Can I clear every entry gate with characters I already own? | Do not start. Gates do not open with levels. |
| Does my realistic session pattern generate the attempts needed in the days left? | Do not start, or accept up front that you will pay to finish. |
| Do I want either the character or the promotion shards? | Skip it and bank the Energy for farming instead. |
| Am I willing to spend premium currency here rather than on a promotion? | Decide the ceiling now, before the pressure arrives. |
| Is my working team strong enough for the later tiers? | Difficulty escalates. Comfortable early tiers tell you nothing. |
Five yeses and a challenge is excellent value — an exclusive character plus promotion material, for Energy you were going to spend anyway.
Anything else and the disciplined play is to run the early tiers for whatever partial rewards they pay, then stop deliberately rather than drift into paying for the rest.
How challenges compare with the rest of the game
It helps to see where this mode sits.
| Mode | Always available | Main reward | What actually limits you |
|---|---|---|---|
| Challenge | No — timed window | Exclusive character, promotion shards | Roster breadth and the deadline |
| Survivor | Yes | Depth-scaled rewards | Sustain and health management |
| Multiplayer | Yes, in seasons | Season rewards, Nth Metal | Defence teams and swap discipline |
| Battles | Yes | Power Credits, materials | Energy |
Three of these forgive a bad week. One does not. That is the entire reason challenges deserve planning the others do not.
When to skip on purpose
Skipping is a legitimate result and it is badly under-used. Skip when:
- You cannot clear the gates. Nothing else on this list matters if this one is true.
- You joined late. A challenge with a third of its window left asks the same completion of you in less time. The maths rarely works.
- You are saving for a promotion. Promotions are permanent account progress. A challenge character you cannot promote is a portrait.
- The featured character fits nothing you play. Check the shards first — if those are useful, the character being irrelevant is fine. If neither is useful, the whole event is optional.
- Your team is comfortable early but thin at depth. Escalating difficulty punishes exactly this, and you find out late, after you have committed.
The player who skips two challenges cleanly and finishes the third is meaningfully further ahead than the player who half-finishes all three.
If you would rather not chase the window
We sell characters and currency, so read this section with the scepticism it deserves.
The genuine case: challenge gates are a roster-breadth problem, and breadth is the one thing grinding solves slowly and awkwardly. If you keep failing gates rather than fights, that is a structural gap rather than a patience gap, and it does not close on its own.
The case against: buying a character to enter a challenge you then cannot finish for the other reasons above is two mistakes stacked. Sort out the Energy arithmetic and the difficulty ceiling first, then decide.
If you do order, browse characters or currency. Delivery is usually around twenty minutes for currency once confirmed, and longer for characters because there is more to set up by hand. We support both Android and iOS, nothing is installed on your device, and checkout needs a Discord ID or a Telegram username because a person handles every order rather than a script.
New customers also get a one-time first-order bonus on top of whatever they buy: 65,000 Nth Metal, 40,000,000 Power Credits, and 500 Energy. For a challenge specifically, the Energy and Nth Metal are the parts that matter — roughly the buffer that turns a marginal window into a comfortable one.
Before ordering anything, read are Injustice mods safe? and are Injustice mods worth it?. Between them they cover the risk and the value honestly, rather than the sales version of either.
The short version
- Challenges are the only content with a deadline. Plan them; do not improvise.
- Gates ask who you own, not how strong they are. Breadth beats power here.
- Do the Energy arithmetic across the whole window on day one.
- The shards can be worth more than the character. Check both before deciding.
- Once you start buying refills, ask whether you would spend that currency on this character with no challenge running.
- Skipping two cleanly beats half-finishing three.
Where to go next
- Injustice character promotion — what the shards challenges award are actually for
- Injustice Energy — the attempts arithmetic that decides whether you finish
- Injustice Nth Metal — what refills and revives really cost you
- Best Injustice characters — where the investment goes once the window closes
- Injustice events — how challenges compare with the rest of the calendar
- Browse Injustice characters — current character listings