Stack Attack!! vs Zippy Sum
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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!
Zippy Sum
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ZippySum is a fast-paced number puzzle game where every second counts. Tap number tiles that add up to the target before the timer runs out. Build combos, chase high scores, and return every day for a fresh Daily Challenge. Features: • Fast 60-second puzzle rounds • Simple tap-to-sum gameplay • Combo scoring system • Daily Challenge mode • Local stats and streak tracking • Offline gameplay support Easy to learn. Hard to stop.
Screenshots
Verdict
The clearest difference is in-app purchases: Zippy Sum at none against Stack Attack!!'s 19. On price, update cadence, ads 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
Both are free to download. Stack Attack!! sells 19 one-off in-app purchases. Zippy Sum asks for nothing beyond the download.
Stack Attack!! ships an update every 2 weeks, Zippy Sum weekly. The most recent releases landed on October 22, 2026 and October 23, 2026 respectively.
| Parameter | Stack Attack!! | Zippy Sum |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (399 ratings) — better | — |
| Positive reviews | 23.2% of reviews | — |
| Number of ratings | 399 — better | — |
| Update frequency | Every 2 weeks | Weekly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 247 MB | 27 MB |
| Age rating | 12+ | 4+ |
| Developer | Voodoo | Pushkar Kathuria |
Bugs and requests
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
Zippy Sum
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Stack Attack!!
- Gem Pack Small$0.99
- Gold Pack Small$0.99
- Starter Pack$2.99
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- 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
Zippy Sum
No in-app purchases
