Zero? vs Knight Tour Trainer
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zero?
A fast-paced number game where players must quickly determine if sums of numbers are multiples of ten. Offers various modes for solo play or head-to-head challenges with friends.
- Sum calculation challenges
- Timed gameplay
- Relaxed mode without time pressure
- Two-player head-to-head mode
- Multiplayer on a single device
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Can you tell if the sum of 3 numbers are a multiple of ten? 4 numbers? More? It sounds easy, but hurry... time is running out! Challenge your friends, and play face-to-face on a single iPad or iPhone! Fun for all ages, choose your favourite mode: • Zoom & Zen, for a fast or easy-paced challenge • Relax, for stress-free fun without the time pressure • Two-player, the unique way to play with your friends in head-to-head action! Reviews for Sum Fun: “ It’s a solid math game, one that brings in interesting gameplay ideas and which has a stellar execution ” – AppGames.net: 9 / 10 “ By the time your kids have played with this app a few times, they’ll be adding up the numbers faster than you can say, ‘What’s six plus eight?’ ” – Fun2Tap: 5 / 5
Knight Tour Trainer
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Knight Tour is a classic chess puzzle: move the knight so it visits every square exactly once. Train your logic and concentration while solving increasingly challenging boards. Features: • Multiple board sizes (from beginner to expert) • Clean and intuitive gameplay • Light & dark themes • Smart hints to guide your moves • Achievements to track your progress • Game Center leaderboards — compete for first place on every board • Complete full tours, earn achievements, and become the Champion Perfect for fans of chess, puzzles, and brain training games.
Screenshots
Verdict
The clearest difference is iOS requirement: Zero? at 8.0 against Knight Tour Trainer's 14.0. On price, update cadence, ads and in-app purchases 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.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.
| Parameter | Zero? | Knight Tour Trainer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 27 MB | 76 MB |
| Age rating | 4+ | 4+ |
| Developer | Greg Sharpe | Vitalii Medvediev |
In-app purchases
Zero?
No in-app purchases
Knight Tour Trainer
No in-app purchases
Questions
Is Zero? free?
Is Knight Tour Trainer free?
Do Zero? or Knight Tour Trainer have ads?
Which is updated more often, Zero? or Knight Tour Trainer?
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