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Everything you need, in one place.
Logos, screenshots, the app icon and a fact sheet, packaged so you do not have to ask. Review copies and promo codes are available on request.
Boilerplate
Ninefall is a chain-reaction number puzzle for iPhone and iPad. Every tile holds a number: play one from your hand and the values add, the tile flips, and every lower-numbered neighbour topples after it. Past nine, numbers roll over, so 6 + 6 = 2. Across eight worlds and 96 hand-calibrated levels, every board ships machine-verified as solvable in its par. It is free to start, with the first two worlds and a daily puzzle at no cost and a single $4.99 in-app purchase that unlocks everything else forever. No ads, no subscription, no tracking, and the whole game fits in 3.3 MB. Made by one person, Thomas Sobstyl.
One-liner
A chain-reaction number puzzle where past nine, numbers roll over.
Key facts
- Developer
- Thomas Sobstyl, solo
- Released
- 20 August 2026
- Platforms
- iPhone, iPad
- Current version
- 1.3
- Requires
- iOS 17 or later
- Android
- Built, in closed testing on Google Play
- Price
- Free to start
- In-app purchases
- One, "Full game, forever", $4.99
- Free without paying
- Worlds 1 and 2, a secret level, the Daily Flip
- Download size
- 3.3 MB
- Content
- 8 worlds, 96 levels, 7 secrets
- Seasonal packs
- Autumn, 15 boards, free while it runs
- Ads and tracking
- None
- Languages
- 9
Angles that might interest you
- Every level carries a proof. A solver verifies each board before it ships: solvable, par exact, master goal reachable. The witness is stored with the level and re-checked on every build.
- 3.3 megabytes. No game engine, no cross-platform framework, no third-party code. Written natively, which is why it is smaller than most screenshots of it.
- A daily puzzle with no server. The Daily Flip is generated on the device from the date alone, so the whole world gets the same board with no account, no backend and no analytics.
- Free to start, and that is the whole model. Two worlds and the daily puzzle cost nothing; one $4.99 purchase opens the rest, forever. No lives, no energy, no hint packs, no second product, and no countdowns or fake discounts on the unlock. Everyone who bought the game while it was paid keeps everything and is marked a Founder, automatically.
- A season with a rule of its own. Autumn is fifteen dated boards built on a tile that loses a number with every placement and eventually falls. They open one a day from October 1 and are free for everyone while the season runs.
- The daily puzzle on the Home Screen, not just its streak. The large widget draws today's board and the four numbers in hand, so a player can plan the cascade before opening the app, and raises the cleared board once they solve it. On iOS 27 it fills the screen at extra-large.
- One person. Design, code, art, sound, nine localisations and the level solver.
Logo usage
- The cascade mark is always full colour. Please do not recolour it.
- Keep clear space of at least the height of the wordmark's N on all sides.
- Minimum sizes: wordmark 90 px wide, cascade mark 96 px, app icon 40 px.
- The wordmark is two-tone: NINE in ink, FALL in coral.