Comparison

Zone 21 vs Block Blast!

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Zone 21

A fast-paced card game where players aim to keep their card total between 0 and 21 to score points and win real-world rewards and cash prizes. Compete against others globally in timed multiplayer matches.

Highlights
  • Mathematical card game mechanics
  • Stay between 0 and 21
  • Win real cash prizes
  • Multiplayer challenges
  • Timed matches
  • Global leaderboards
Read full description

Welcome to Zone 21 - Fast Math Solitaire a brand new card game where you can win real-world rewards and cash prizes (where available)! Try to stay between 0 and 21. It's not easy and tries to keep the target number close to 21 to earn more points! It's a jackpot when you get exactly 21 and earn great bonus points. SOME KEY FEATURES: • Classic mathematical card game with some amazing twists! • Clear the cards from the table and stay between 0 and 21. • Ready for the challenge? Try to hit the target number 21 and get great bonuses. MULTIPLAYER FEATURES: • Play against friends and solitaire around the world! • Calculate cards as quickly as you can! You have 3 minutes to beat your opponent. • Win and show off your scores on the leaderboard! EARN PRIZES: • Challenge people from around the world • Put your skills to the test and compete to win cash prizes! • Cash rewards for top scorers (where allowed)! Challenge people around the world with Skillz, a competition platform complete with leaderboards, trophies, physical or virtual prizes, and an amazing loyalty program that rewards you for playing! If you have any questions or proposals for the game, we hope you contact us at support@ccbrothers.com If you have any questions about the Skillz system or cash tournaments please contact: support@skillz.com

About

Block Blast!

Engage your mind with a vibrant block-crushing puzzle game. Solve daily challenges, strategically place colorful cubes on an 8x8 board, and aim for endless high scores. Enjoy satisfying chain reactions and a relaxing yet challenging experience, playable offline.

Highlights
  • Daily puzzle variety
  • Block puzzle saga
  • Endless high score hunt
  • Strategic puzzle gameplay
  • Adventure mode
  • Offline fun
Read full description

Enter the world of Block Blast, where every move is a test of your brain and strategy. Dive into the thrill of block crush gameplay—watch vibrant cubes explode in color as you solve each puzzle. With fresh daily puzzle challenges that keep your mind engaged and an endless high score system that rewards your best strategies, Block Blast delivers nonstop excitement for casual players and puzzle masters alike. Why You'll Love Block Blast • Daily Puzzle Variety: Every day brings a new puzzle twist, ensuring there’s always something fresh to solve and new rewards to earn. • Block Puzzle Saga: Match colorful blocks on an 8x8 board and enjoy the satisfying cascade of each block crush. • Endless High Score Hunt: Push yourself further with each game—break your own records, and climb higher every time you play. • Casual Yet Challenging: Easy to pick up, but packed with logic-based challenges that sharpen your mind. • Offline Fun: Play anywhere, anytime—no WiFi required. Perfect for a subway ride or while waiting in the car. Features of Block Blast • Strategic Puzzle Gameplay: Drag, place, and match cube blocks on board to trigger chain reactions. • Adventure Mode: Experience progressive levels with unique jigsaw designs and colorful themes. • Daily Puzzle Rewards: Stay motivated with special challenges that refresh your brain every day. • Score Mastery: Compete against friends, share your results, and prove who dominates the endless high score. • Stunning Block Effects: Feel the rush of every block crush with dynamic visuals and relaxing music effects. How to Play • Drag & Match: Place cube blocks on the 8x8 board with precision. • Crush & Score: Complete rows or columns of tiles and watch the block crush effects cascade. • Chase Combos: Plan your moves to unlock massive points and extend your endless high score run. • Stay Strategic: Keep your board clear to make room for bigger plays. Jump into the Ultimate Block Puzzle Saga! Ready for mind-sharpening fun? Take on fresh daily puzzles, master the art of the block crush, and see how far you can push your endless high score. Download Block Blast today and start your adventure! Privacy policy: https://hungrystudio.com/privacyus.html Terms of Use: https://hungrystudio.com/serviceus.html

Screenshots

Zone 214 screens
Block Blast!4 screens

Verdict

The call

The clearest difference is in-app purchases: Zone 21 at none against Block Blast!'s 3. Zone 21 also leads on iOS requirement (12.0 vs 15.0). Block Blast!'s advantage is update cadence (every 3 days vs every 3 months) and ratings volume (2.7M vs 23). On price, rating, review sentiment and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Block Blast! sells 3 in-app purchases, starting at $4.99 per 7 days. Zone 21 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Zone 21 against 4.9 for Block Blast!. That said, the two scores are not equally well evidenced: Block Blast! has 2.7M ratings behind it against 23, so its average is the more settled of the two. Written reviews are what separate them: 83% of Zone 21's written reviews are positive against 76% of Block Blast!'s.

UpkeepUpdate frequency

Zone 21 ships an update every 3 months, Block Blast! every 3 days. The most recent releases landed on June 9, 2026 and September 25, 2026 respectively.

Scorecard6 real differences · 5 level
Zone 21 versus Block Blast!: the parameters behind the verdict, then further details
ParameterZone 21Block Blast!
PriceFreeFree
Rating4.8 (23 ratings)4.9 (2.7M ratings) — better
Positive reviews83.3% of reviews — better76.4% of reviews
Number of ratings232.7M — better
Update frequencyEvery 3 monthsEvery 3 days — better
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
Best chart rank—#8 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size155 MB194 MB
Age rating17+12+
DeveloperCodeCube Brothers PartnershipHungry Studio

Customer experience

Zone 21

All ratings23 ratings
Positive95.7%
Neutral4.3%
Negative0.0%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Block Blast!

All ratings2,718,125 ratings
Positive97.0%
Neutral0.9%
Negative2.1%
Written reviews18,615 reviews
Positive76.4%
Neutral7.1%
Negative16.5%

Bugs and requests

Zone 21

Not enough reviews yet to summarise bugs or requests.

Block Blast!

Reported bugs

3 issues
  • Retry button not functioning properly
  • Levels resetting unexpectedly
  • Blocks not registering properly

Requested features

4 requests
  • Option to pay for ad-free experience
  • More game modes and level variety
  • Ability to rotate/manipulate blocks
  • Progression and rewards system

In-app purchases

None

Zone 21

No in-app purchases

3 purchases

Block Blast!

Subscriptions3
  • 1 Week Subscribe$4.997 Days
  • 1 Month Subscribe$9.991 Month
  • 1 Year Subscribe$49.991 Year

Questions

Is Zone 21 free?
Zone 21 is free to download, with no in-app purchases.
Is Block Blast! free?
Block Blast! is free to download, with in-app purchases available.
Which has better reviews, Zone 21 or Block Blast!?
Block Blast! is rated higher. Zone 21 averages 4.8 out of 5 from 23 ratings, while Block Blast! averages 4.9 from 2.7M ratings.
Do Zone 21 or Block Blast! have ads?
Both Zone 21 and Block Blast! show ads.
Which is updated more often, Zone 21 or Block Blast!?
Zone 21 ships an update every 3 months, and Block Blast! every 3 days. Most recently, Zone 21 was updated on June 9, 2026 and Block Blast! on September 25, 2026.

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