Merge Defense 3D! vs Stack Attack!!
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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!
Stack Attack!!
Engage in intense battles against waves of enemies, strategically demolishing their formations with powerful weapons. Upgrade your capabilities by selecting the best skills to protect the cube world from a malevolent hex invasion.
- Defeat enemy waves
- Demolish enemy stacks
- Upgrade skills
- Save the cube world
- Space invader gameplay
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Defeat waves of enemies! Use your weapons to demolish the enemies' stacks! Choose the best skills to upgrade your power! Save the cube world from the evil hexes!
Screenshots
Verdict
The clearest difference is rating: Stack Attack!! at 4.3 against Merge Defense 3D!'s 3.7. Stack Attack!! also leads on update cadence (every 2 weeks vs every 3 weeks). On price, review sentiment, ratings volume 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
Both are free to download. Merge Defense 3D! sells 5 one-off in-app purchases and Stack Attack!! sells 19 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Stack Attack!! holds the better App Store score, 4.3 against 3.7. Both are backed by a comparable volume of ratings — 1.1K and 399 respectively. Written reviews complicate that: 29% of Merge Defense 3D!'s written reviews are positive against 23% of Stack Attack!!'s, so the app with the better star average is not the one people write more warmly about.
Merge Defense 3D! ships an update every 3 weeks, Stack Attack!! every 2 weeks. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.
| Parameter | Merge Defense 3D! | Stack Attack!! |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (1.1K ratings) | 4.3 (399 ratings) — better |
| Positive reviews | 28.8% of reviews — better | 23.2% of reviews |
| Number of ratings | 1.1K — better | 399 |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 157 MB | 247 MB |
| Age rating | 4+ | 12+ |
| Developer | Tatem Games Inc. | Voodoo |
Customer experience
Merge Defense 3D!
Stack Attack!!
User reviews
Merge Defense 3D!
From 1.1K App Store ratingsWhat we love
- ⭐ Good game concept
- 🎮 Enjoyable gameplay
- 💎 Addictive
Room to improve
- 💸 Excessive ads
- 🔁 Ads interrupt gameplay
- 🔒 Paid ad-free version doesn't work
- 🐛 Glitches and crashes
- 🔋 Drains battery quickly
Stack Attack!!
From 399 App Store ratingsWhat we love
- 👍 Simple and fun gameplay
- 🚀 No ads or microtransactions
- 💡 Nice armor upgrade system
Room to improve
- 🐛 Glitches and bugs, especially after updates
- 🐛 Progress and upgrades getting reset or lost
- 🐛 Levels becoming unplayable after a certain point
Bugs and 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
Stack Attack!!
Reported bugs
3 issues- Enemies' health scaling with player's attack power
- Levels freezing or getting stuck at checkpoints
- Weapon and upgrade levels getting downgraded randomly
Requested features
3 requests- Mute sound effects option
- Better communication from developers about updates
- More content and stages to progress through
In-app purchases
Merge Defense 3D!
- Pack of Gems$0.99
- Double Gems$1.99
- Remove Ads$2.99
Show 2 moreShow fewer
- Promo Bundle$3.99
- Big Promo Bundle$6.99
Stack Attack!!
- Gem Pack Small$0.99
- Gold Pack Small$0.99
- Starter Pack$2.99
Show 16 moreShow fewer
- No Ads$2.99
- Gem Pack Medium$4.99
- 2X Speed!$4.99
- Gold Pack Medium$4.99
- Skip'its Medium Pack$5.99
- Gem Pack Large$9.99
- Gold Pack Large$9.99
- Premium Pass$14.99
- Gem Pack XL$19.99
- Skip'its Large Pack$19.99
- Gold Pack XL$19.99
- Diamond Hero$29.99
- Gem Pack XXL$49.99
- Gold Pack XXL$49.99
- Gem Pack XXXL$99.99
- Gold Pack XXXL$99.99
Questions
Is Merge Defense 3D! free?
Is Stack Attack!! free?
Which has better reviews, Merge Defense 3D! or Stack Attack!!?
Do Merge Defense 3D! or Stack Attack!! have ads?
Which is updated more often, Merge Defense 3D! or Stack Attack!!?
Other comparisons
