Sync vs Merge Defense 3D!
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- 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
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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!
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.
- Turn-based gameplay
- Merge defenders to upgrade
- Strategic placement
- Offline play
- Challenging puzzle
- Power-ups and unlocks
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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
Verdict
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
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.
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.
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.
| Parameter | Sync | Merge Defense 3D! |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (33 ratings) — better | 3.7 (1.1K ratings) |
| Positive reviews | 96.8% of reviews — better | 24.5% of reviews |
| Number of ratings | 33 | 1.1K — better |
| Update frequency | Every 40 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 9 MB | 157 MB |
| Age rating | 4+ | 4+ |
| Developer | Tozai, Inc. | Tatem Games Inc. |
Customer experience
Sync
Merge Defense 3D!
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
Sync
No in-app purchases
Merge Defense 3D!
- Pack of Gems$0.99
- Double Gems$1.99
- Remove Ads$2.99
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- Promo Bundle$3.99
- Big Promo Bundle$6.99









