Grid Journey vs must be one
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Grid Journey
Solve puzzles by merging gems to forge a path through a mysterious cave. Explore new realms, including the Windy River, with over 500 levels. Revisit stages to improve scores or tackle ultimate challenges.
- Gem merging puzzles
- Mysterious cave exploration
- Over 500 levels
- Windy River chapter
- Score challenges
- No-restart challenges
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Merge gems to clear a path through a mysterious cave. What secrets will you uncover? Tickle your brain, as you find your way through an unknown realm! In the latest chapter, sail the Windy River! Now 500 levels to explore! With Challenges, revisit earlier stages of your journey to improve your scores. Or try the ultimate challenge, to complete an entire stage without any restarts!
must be one
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must be one is a number puzzle built on a single rule — the one in its name. A grid of numbers. Four operators. Combine neighboring tiles with arithmetic and collapse the whole board down to a single 1. That's the entire game: all becomes one. It reads as obvious for about three moves. Then it doesn't. - One rule, no filler — no twenty-minute tutorial, no menus to dig through. You understand it in seconds and spend the rest of your time actually thinking. - Always solvable — every stage is generated so that a solution is guaranteed to exist before you ever see it. If you're stuck, that's on you, not the board. - A climb that keeps widening — early stages stay in single digits; later ones open the range up and the arithmetic gets meaner. - Free, and quick to pick up. One stage on the train; look up an hour later. From office-canard — a one-person studio making small, system-first games. If this one gets its hooks in, there are more small games where it came from.
Screenshots
Verdict
The clearest difference is in-app purchases: must be one at none against Grid Journey's 1. Grid Journey's advantage is ads (none vs shown). On price, update cadence, 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
Both are free to download. Grid Journey sells 1 one-off in-app purchase. must be one asks for nothing beyond the download.
Grid Journey ships an update every 2 months, must be one every 5 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | Grid Journey | must be one |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 5 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 141 MB | 6 MB |
| Age rating | 9+ | 4+ |
| Developer | Stephen Rice | office-canard games |
In-app purchases
Grid Journey
- Upgrade to Full Game$2.99
must be one
No in-app purchases








