Power Credits are the primary currency in Injustice: Gods Among Us Mobile, used to purchase characters from the store, promote existing characters, unlock gear slots, and fuse gear cards. While the game offers options to buy credits with real money, numerous methods exist to earn them for free. This guide covers every reliable way to build a credit balance and spend it wisely.
Standard Battle — Primary Credit Source
Standard Battle (also called Campaign) consists of 72 battles with increasing difficulty, each containing multiple fights. This is the main source of Power Credits and the game mode beginners should focus on early. If you are just starting out, our beginner guide covers the fundamentals.
Each battle rewards credits upon completion. First-time completions provide bonus credits, making early-game progression especially lucrative. As battles increase in difficulty, credit rewards scale accordingly.
For efficient grinding, focus on battles that can be completed quickly. Later battles reward more credits per completion, but earlier battles often provide better credit-per-minute ratios due to faster clear times. Choose battles based on roster strength and clear speed.
Daily Login Rewards
Logging in every day without missing builds toward milestone rewards. The login system operates on an 80-day cycle:
- Day 10: Random Bronze or Silver character
- Day 80: Free Gold Joker/Insurgency card
Between these milestones, daily logins reward Power Credits, Alliance Credits, and energy refill cards. A ten-day login streak yields a random Bronze or Silver character. Reaching 80 consecutive login days provides a free Gold Joker/Insurgency card, giving a head start in higher tiers of the game.
These rewards repeat after day 80, creating a consistent cycle of free resources for players who log in regularly.
Challenge Mode Participation
Challenge Mode rotates on a regular schedule, offering exclusive Gold characters by completing fights within the event window. Even players who cannot complete the full challenge benefit from participation.
Completing just the first two battles of any Challenge Mode rewards a free Bronze Booster Pack and a meaningful amount of Power Credits. Every challenge is worth attempting regardless of roster strength.
Full challenge completions reward up to 200,000 or more Power Credits, depending on the event. This represents one of the largest single credit payouts available in the game. Challenge Mode does not need to be completed in a single day, making it accessible to players with limited play time. Our Challenge Mode guide covers event schedules and requirements.
Store Sales and Bulk Purchases
The in-game store periodically runs sales events where spending large amounts of Power Credits on specific characters grants bonus Bronze and Silver characters. These bonus cards can be sold back to the store for 30% of their purchase price, effectively providing a credit rebate.
During a sale, purchasing a large-credit character might grant multiple bonus cards worth thousands of credits when sold. The return varies by sale, but strategic spending during these events maximizes value.
Patience is key. Save credits until a sale activates, then spend strategically. Impulse purchases outside of sales waste potential value.
Selling Duplicate Characters
When store purchases or pack openings yield duplicates, Bronze and Silver duplicates can be sold back to the store for 30% of their purchase price. This is not a profit, but it recovers a portion of the investment.
A Bronze character purchased for 5,000 credits returns 1,500 credits when sold. A Silver character purchased for 25,000 returns 7,500. Over time, these partial refunds accumulate, especially during store sales when multiple characters are acquired in bulk.
Never sell a character that might be promoted later. However, duplicates and characters that do not fit the team should be liquidated to fund the next purchase.
Online Battle Weekly Rewards
Online Battle runs in weekly seasons. Achieving certain percentage ranks awards gear, Power Credits, Nth Metal, and occasionally unique characters. Play this mode every week to collect season rewards — even one fight per season counts. Our multiplayer guide covers ranking strategies and team building.
The credit payouts from Online Battle scale with rank. Higher ranks receive more credits at season end. Even finishing in the bottom 50% provides a small credit payout that adds up over time.
Gear seasons in Online Battle offer legendary gear at top rankings. While not direct credits, legendary gear reduces the need to spend credits on gear from the store, indirectly saving currency for character purchases.
Survivor Mode Prize Wheel
Survivor Mode resets daily and can be played for free on the first attempt. Before each fight, a prize wheel spins that can reward Power Credits multipliers, gear cards, Augment Cards, Nth Metal, or shards. For strategies and reward breakdowns, see our Survivor Mode guide.
The wheel is random, but the potential rewards make it worth spinning every day. A Power Credits multiplier can double or triple the next Standard Battle payout, effectively boosting the primary credit source.
Survivor Mode also drops gear cards and Augment Cards directly, reducing the need to spend credits on gear upgrades. Consistent daily play pays dividends across multiple currency systems.
Phantom Zone Event
Phantom Zone is a limited-time event that primarily rewards Nth Metal and Valorium Alloy. While not a direct Power Credits source, the Nth Metal earned can be used to purchase character packs from the Nth Metal store, freeing up Power Credits that would otherwise be spent on those characters.
Complete trials to unlock boss fights, then complete the boss fight to power Phantom Zone Projector Crystals. The event can be reset twice per event at the cost of 50 Nth Metal each, providing additional rewards. Our Phantom Zone guide covers event mechanics and strategies.
What to Spend Credits On
Once Power Credits are accumulated, spend them wisely. Prioritize the following purchases:
- Support cards — Cards like The Spectre, Swamp Thing, and other team-wide bonuses benefit every character. Buy all support cards first.
- Gear slots — Unlocking the second and third gear slots for main characters costs 20,000 and 40,000 credits respectively. These are essential investments. Our gear shards guide explains gear systems in detail.
- Silver characters — Silver characters offer strong stats and remain relevant longer than Bronze cards. Purchase Silver cards from the store when they fit the team composition.
- Gold characters during sales — Wait for store sales before purchasing Gold characters to maximize bonus card returns.
Avoid spending credits on Bronze characters from the store. They become obsolete within days and waste limited currency. The same applies to partial gear purchases — save until legendary gear pieces that provide meaningful stat increases can be afforded. For more spending strategies, see our character promotion guide.
Summary
Earning free Power Credits in Injustice Mobile requires consistent daily play, patience with store sales, and strategic spending. Focus on Standard Battle as the primary income, supplement with daily login rewards and Challenge Mode participation, and always wait for sales before making large purchases. With discipline, a competitive roster can be built without spending a single dollar.