Comparison

Space Bubble Puzzle vs Retro Block Duo

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

Head to head
About

Space Bubble Puzzle

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Space Bubble Puzzle is a kind of unique game that combines Sudoku with a match-3 puzzle. Enjoy the exhilaration of connecting blocks to remove them all at once! Blocks of the same color increase your score even more! There's no time limit, so you can play at your own pace and relax. Start playing in your spare time, stop midway, and resume anytime! Game Features: 1.Simple but addicting mechanics ・Place blocks of different shapes on a 9x9 board and erase them ・You can erase the placed blocks by lining them up vertically or horizontally ・You can erase blocks even if you place them without gaps in a 3x3 area ・You can increase your score by connecting blocks of the same color to erase them 2. A chance to get a high score! Activate Fever Time! ・When you erase a certain number of blocks, Fever Time is activated for 30 seconds ・During Fever Time, you can use useful items without consuming coins or watching videos ・Rotate the blocks you've been dealt or replace them with other blocks to erase them one after another! ・When Fever Time ends, the gauge will go to 0 and the next activation condition will be displayed immediately 3. Achieve the conditions to increase your level and aim for a high score! ・Achieve the conditions within the specified number of turns to move on to the next level! ・As you increase the level, the clearing conditions increase, and the difficulty increases! ・Place blocks of the same color to erase colored obstacle squares! ・Rainbow colored blocks can be ignored as obstacle squares!

About

Retro Block Duo

Features
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Classic Color Blocks, Modern Battles! Rediscover the classic block puzzle you love, now supercharged with a thrilling 2-player multiplayer twist! RetroBlockDuo drops you into the heart of classic cube-blasting puzzle action. Challenge your friends, train your brain, and become the ultimate block master! Game Features: - Classic Solo Mode: Hone your skills and chase high scores in the timeless color block-dropping experience. Watch cubes blast away in satisfying sequences! - 2-Player Battles: Challenge friends in exciting dual-player battles! Who will reign supreme in this classic cube-blasting showdown? - Play Anywhere, Anytime: No Wi-Fi? No problem! Enjoy seamless color block gameplay on the go. - Sharpen Your Mind: Boost your logic, strategy, and reaction time with every clever cube move and block blast combo. - 100% Free to Play: Dive into endless classic block fun without spending a dime. This game is for you if... - You love classic block puzzles but crave a new competitive 2-player challenge. - You're looking for the perfect color cube game to battle friends and family. - You want a fun way to keep your mind sharp and train your brain with classic block-blasting action. - You need a great classic puzzle game that works perfectly offline. The block blast battle is on! Download RetroBlockDuo now and claim your title as the classic color cube puzzle champion!

Screenshots

Space Bubble Puzzle4 screens
Retro Block Duo3 screens

Verdict

The call

The clearest difference is update cadence: Retro Block Duo at fortnightly against Space Bubble Puzzle's monthly. Space Bubble Puzzle's advantage is iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Space Bubble Puzzle ships an update monthly, Retro Block Duo fortnightly. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

Scorecard2 real differences · 4 level
Space Bubble Puzzle versus Retro Block Duo: the parameters behind the verdict, then further details
ParameterSpace Bubble PuzzleRetro Block Duo
PriceFreeFree
Update frequencyMonthlyFortnightly — better
AdsYesYes
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size136 MB15 MB
Age rating4+4+
DeveloperYuta Kamiya咏武 王

In-app purchases

None

Space Bubble Puzzle

No in-app purchases

None

Retro Block Duo

No in-app purchases

Questions

Is Space Bubble Puzzle free?
Space Bubble Puzzle is free to download, with no in-app purchases.
Is Retro Block Duo free?
Retro Block Duo is free to download, with no in-app purchases.
Do Space Bubble Puzzle or Retro Block Duo have ads?
Both Space Bubble Puzzle and Retro Block Duo show ads.
Which is updated more often, Space Bubble Puzzle or Retro Block Duo?
Space Bubble Puzzle ships an update monthly, and Retro Block Duo fortnightly. Most recently, Space Bubble Puzzle was updated on October 13, 2026 and Retro Block Duo on October 12, 2026.

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