Comparison

Sync vs Merge Defense 3D!

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

Head to head
About

Sync

Engage your mind with a unique puzzle experience where you guide synchronized balls to designated holes using simple swipes. Navigate through increasingly complex mazes, strategically using walls to achieve your goals. Enjoy a tranquil yet stimulating challenge with 80 levels, designed for thoughtful problem-solving without time pressure.

Highlights
  • Swipe to move synchronized balls
  • Align balls into holes
  • Use maze walls for strategy
  • Avoid falling off the platform
  • Progress through 80 levels
  • No time limits or scores
  • Develop concentration and problem-solving skills
Features
Read full description

Greetings 21st Century Earthlings! Transport your mind beyond earthly concerns with the engaging puzzle experience of Sync-Ball. Gently swipe your finger on the screen to move the synchronized balls up, down, left and right. Your goal is to align the balls and drop them into the holes on the same swipe. • Use maze walls to block movement and align the balls to achieve your goal. • Watch-out for the edges! If you roll a ball off the platform, you'll have to start over. • Begin with two-ball puzzles and simple mazes that teach the game's elegant mechanics and strategies. • Advance to more complex puzzles with up to four synchronized balls in play at one time. And you thought rocket science was tough! • Experience 80 levels of stellar satisfaction. Do you long to escape the frenzied pace of modern life? Sync-Ball was designed to provide the perfect balance of tranquility and cerebral stimulation for a quick escape wherever and whenever you need one. • No time limits mean you can ponder a puzzle for as long as you like without incurring a penalty. • No scores artificially inflate your sense of panic. • Progress at your own pace. • Reset a stage as often as you like. • Concentration, memory and problem-solving skills are all you need. Have fun!

About

Merge Defense 3D!

A turn-based tower defense game where players strategically place and merge defenders to fend off advancing enemy blocks. It offers offline play and a challenging puzzle experience for a daring mind.

Highlights
  • Turn-based gameplay
  • Merge defenders to upgrade
  • Strategic placement
  • Offline play
  • Challenging puzzle
  • Power-ups and unlocks
Read full description

Merge Defense 3D is an easy to learn, hard to master Tower Defense game. Simple controls, turn based game play, and tactical depth makes this game best time killer game for a daring mind. How to play: • Enemy Blocks advance each turn • Place new defenders on the board to protect from enemies • Defenders shoot automatically each turn • Merge two defenders of the same level to upgrade its power • Collect Keys and Gems to use power ups and unlock new defender • Survive as long as you can Game Features: • Challenging brain puzzle. Think ahead! • Beautifully easy and simple, no pressure and no time limit. • Offline play • Completely free Have fun!

Screenshots

Sync4 screens
Merge Defense 3D!4 screens

Verdict

The call

The clearest difference is review sentiment: Sync at 97% against Merge Defense 3D!'s 25%. Sync also leads on rating (4.8 vs 3.7) and in-app purchases (none vs 5). Merge Defense 3D!'s advantage is price (Free vs $0.99) and update cadence (every 3 weeks vs every 40 months). On device support and iOS requirement 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

Merge Defense 3D! is free to download; Sync costs $0.99 up front. Merge Defense 3D! sells 5 one-off in-app purchases. Sync asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sync holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Merge Defense 3D! has 1.1K ratings behind it against 33, so its average is the more settled of the two. Written reviews point the same way: 97% of Sync's written reviews are positive against 25% of Merge Defense 3D!'s.

UpkeepUpdate frequency

Sync ships an update every 40 months, Merge Defense 3D! every 3 weeks. The most recent releases landed on September 10, 2026 and September 24, 2026 respectively.

Scorecard8 real differences · 2 level
Sync versus Merge Defense 3D!: the parameters behind the verdict, then further details
ParameterSyncMerge Defense 3D!
Price$0.99Free — better
Rating4.8 (33 ratings) — better3.7 (1.1K ratings)
Positive reviews96.8% of reviews — better24.5% of reviews
Number of ratings331.1K — better
Update frequencyEvery 40 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size9 MB157 MB
Age rating4+4+
DeveloperTozai, Inc.Tatem Games Inc.

Customer experience

Sync

All ratings33 ratings
Positive93.9%
Neutral3.0%
Negative3.0%
Written reviews31 reviews
Positive96.8%
Neutral3.2%
Negative0.0%

Merge Defense 3D!

All ratings1,098 ratings
Positive64.8%
Neutral5.2%
Negative30.1%
Written reviews212 reviews
Positive24.5%
Neutral11.8%
Negative63.7%

Bugs and requests

Sync

Not enough reviews yet to summarise bugs or requests.

Merge Defense 3D!

Reported bugs

3 issues
  • Paid ad-free version doesn't remove ads
  • Game freezes during ads
  • Progress lost when game crashes

Requested features

3 requests
  • Add 'End Turn' button
  • Improve difficulty scaling past level 1000
  • Increase max level for defense towers

In-app purchases

None

Sync

No in-app purchases

5 purchases

Merge Defense 3D!

One-time5
  • Pack of Gems$0.99
  • Double Gems$1.99
  • Remove Ads$2.99
Show 2 more
  • Promo Bundle$3.99
  • Big Promo Bundle$6.99

Questions

Is Sync free?
Sync costs $0.99, with no in-app purchases.
Is Merge Defense 3D! free?
Merge Defense 3D! is free to download, with in-app purchases available.
Which has better reviews, Sync or Merge Defense 3D!?
Sync is rated higher. Sync averages 4.8 out of 5 from 33 ratings, while Merge Defense 3D! averages 3.7 from 1.1K ratings.
Do Sync or Merge Defense 3D! have ads?
Merge Defense 3D! shows ads; Sync does not.
Which is updated more often, Sync or Merge Defense 3D!?
Sync ships an update every 40 months, and Merge Defense 3D! every 3 weeks. Most recently, Sync was updated on September 10, 2026 and Merge Defense 3D! on September 24, 2026.

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