Pixel vs Category Stack
Price, ratings, monetisation and update history for both games, side by side โ with what reviewers say about each.
Pixel
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Collect every Pixel. Master ice, fire and traps. Reach the Plenum. Pixel: The Challenge is a 3D puzzle game in the spirit of the great tile-based logic classics โ completely re-built and yours to master. On every level you gather all the Pixels, find the right keys, and cross water, ice, conveyor belts and monsters until the Plenum portal opens. The logic is grid-clear and deterministic, just like the classics โ but the world is real 3D with smooth animation. Best of all: every one of the 80 levels is provably solvable. A solver works out each solution in advance and stores a replay. No level is down to luck. None is unfair. 80 BASE LEVELS INCLUDED ยท 50 OPTIONAL PREMIUM LEVELS The app purchase includes all 80 base levels across 8 worlds. For more challenges, the optional โPremium Pack โ The Plenumโ unlocks 50 additional levels with a one-time in-app purchase. Purchased premium levels remain available and purchases can be restored. No subscriptions, no currency, no energy timers, no ads. WHY YOU'LL LOVE IT โข 80 hand-crafted levels across 8 worlds โ every one guaranteed solvable โข Classic logic, real 3D โ plan it, solve it, execute it cleanly โข Two art styles โ switch between Voxel (chunky and bright) and Low-Poly (soft and modern) at any time โข Three cameras โ third-person, first-person or top-down; see the puzzle your way โข Fair for everyone โ chase 3 stars as a pro, or switch on Casual mode with no time pressure โข Stuck? Watch the solution โ a built-in walkthrough shows the proven path โข 100% ad-free โ no ads, no tracking, no pop-ups, plays offline WHAT STANDS IN YOUR WAY Keys and doors, water, fire, slippery ice, conveyor belts, bombs, teleporters, cloning machines, switches and buttons โ and all sorts of monsters that move on their own. WANT A LOOK FIRST? The first 20 levels can be played for free in your browser, no download and no account: https://pixelplenum.com/pixel-the-challenge.html Like what you find there? The app gives you the same game with all 80 levels, offline and without a browser. LANGUAGES Interface and level texts in English, German, French and Spanish. No ads. No tracking. Just you, the grid, and the way out.
Category Stack
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Category Stack is a satisfying puzzle game where you solve puzzles by matching visual and word cards with the categories they belong to. Study each card carefully, discover the connection between them, and place each one into the correct category. Some cards use pictures, while others use words, challenging your logic, vocabulary, and ability to spot relationships. Every correct match brings you one step closer to completing the level. Game Features: Unique category-matching puzzle mechanic A fun mix of picture and word cards Simple to learn, increasingly strategic to master Fresh categories with clever obstacles and challenges Relaxing and rewarding gameplay you can enjoy anytime Can you find where every card belongs and complete all the categories?
Screenshots
Verdict
The clearest difference is price: Category Stack at Free against Pixel's $1.99. Pixel's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Category Stack is free to download; Pixel costs $1.99 up front. Pixel sells 1 one-off in-app purchase and Category Stack sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Pixel ships an update every 6 weeks, Category Stack every 3 weeks. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.
| Parameter | Pixel | Category Stack |
|---|---|---|
| Price | $1.99 | Free โ better |
| Update frequency | Every 6 weeks | Every 3 weeks โ better |
| Ads | No โ better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details โ not scored | ||
| Size | 30 MB | 253 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Hergert | Batuhan UCA |
In-app purchases
Pixel
- Full Game (80 Levels)$4.99
Category Stack
- Gold Pack 1$1.99
- Gold Pack 2$7.99
- No Ads Pack$7.99
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- Gold Pack 3$14.99
- Gold Pack 4$29.99
- Gold Pack 5$54.99
- Gold Pack 6$99.99









