Serial 7s vs Bubble Boom
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Serial 7s
This game challenges you to rapidly subtract 7 from a starting number until you can no longer continue. It's based on a cognitive test used to assess attention and memory, with consistent play potentially improving brain skills and helping to prevent cognitive decline.
- Serial 7 subtraction gameplay
- Tests attention and memory
- Helps prevent cognitive decline
- Measures subtraction speed
- Randomized starting numbers
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Serial 7s is a brain training game that tests how fast you can perform continuous subtraction of 7 from a starting number. Inspired by the classic "Serial 7s" task—a standard component of the Mini-Mental State Examination (MMSE)—this game gives a proven cognitive test a fresh twist. Starting with a randomly generated number between 99 and 105, your total time to complete 14 consecutive subtractions of 7 is measured. Serial subtraction by 7 is widely used to evaluate focus, attention span, and working memory. Regular practice can help sharpen your mind and boost cognitive fitness. Recommended for anyone interested in brain training, keeping their mind active, or supporting long-term cognitive health and dementia prevention.
Bubble Boom
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Want to test or improve your reaction? Then this game is for you! In a limited time you need to burst as many bubbles as possible. A new bubble appears in a random location on the screen immediately after you pop a visible bubble. The color of the bubbles can be changed in the settings. The sound can be turned on or off on the main screen (upper right corner).\n\nTrain your reaction, set new records!
Screenshots
Verdict
The clearest difference is ads: Bubble Boom at none against Serial 7s's shown. Serial 7s's advantage is iOS requirement (15.0 vs 17.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Serial 7s | Bubble Boom |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | — |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 42 MB | 1 MB |
| Age rating | 9+ | 4+ |
| Developer | HFX Lab | Vladimir Zhizhin |
In-app purchases
Serial 7s
No in-app purchases
Bubble Boom
No in-app purchases
