Drop one tile, flip the board.
A chain-reaction number puzzle for iPhone and iPad. Play a tile, the values add, and every lower-numbered neighbour topples after it. Past nine, numbers roll over. Free to start, and one purchase opens everything else.
Free to start3.3 MB96 levels 9 languagesPlays offline
This is 1‑11 · Grand Finale, recorded in the game. Nine tiles, one placement, and the whole board goes. That is a Grand Cascade.
Your turn
This is 1‑8 · Descent, the eighth level in the game, exactly as it ships. Three tiles, par two. The obvious move is a trap, and one of these tiles adds nothing at all.
It runs the game's own rules engine, right in the page: the same cascade, the same rollover, the same unlimited undo. No install, no account.
Three laws, no manual
Play a tile from your hand onto one on the board. The values add, and the tile flips face up.
There is no twelve. This is the signature rule, and the reason the greedy move is usually the wrong one.
A flipped tile topples every neighbour holding a lower number, and those topple theirs. Equal numbers block. Nines are fortresses, zeros are scalpels.
Certified fair
Before a puzzle reaches you, a solver searches it exhaustively. It has to be solvable, its par has to be exact, and its optional master goal has to be reachable. The proof is stored next to the level and re-checked on every build.
No board is probably fine. That is why there are no hint packs to sell you: unlimited undo and a solver-powered hint are simply built in.
The real record for the level you just played, taken from the game's own level data. 118 boards carry one: all 96 levels, all seven secrets, and the fifteen boards of the Autumn season. Clear a whole board in a single placement and that is a Grand Cascade, which is what the game is really about.
The journey
Each world introduces a single new piece and then explores it properly. Twelve levels each, and a secret level hidden behind every world after the first: collect a world's gems and it appears.
The grammar of the cascade
The rule
Terrain shapes the flow
Stones
Build your nines in two steps
Sealed tiles
Crack it, then flip it
Ice
Power and surgery
Bombs and traps
Cascades without borders
Portals
The board will not sit still
Shifters
Everything you know, drifting
Everything
The deal, up front
Download it and play. The first two worlds, a secret level and the Daily Flip cost nothing and stay that way. When you want the rest, one purchase opens it, and that is the only purchase there will ever be. No lives, no energy, no currency, no second product.
Nothing is dangled at you either. Locked worlds sit on the map plainly marked, the unlock is one sheet with one price on it, and there are no countdowns or crossed-out numbers anywhere near it.
Free
Nothing to enter, nothing to decline.
Full game, forever $4.99
One purchase. No subscription, ever.
Bought Ninefall when it cost $4.99? Everything stays yours, automatically. The game reads your original purchase from the App Store, unlocks the lot, puts a Founder row in Settings and hands back the first app icon. Nothing to restore, nothing to claim.
Worlds seven and eight
World seven adds the shifter. It gains one after every move you make, whether you touch it or not, and nine falls to nothing. A plan that took four moves to set up is not the same plan by the time you get there.
One shifter, three moves later. Worlds seven and eight arrived after launch, free to everyone who already had the game, and they sit inside the same one unlock today.
The ritual
Today is Daily Flip #251, September 8. The same five-by-five for everyone, everywhere, built on your device from the date alone. There is no server behind it and no account to make.
Keep a streak and put the board itself on your Home Screen. The large widget shows today's grid and the four numbers in your hand, so you can plan the cascade before you open the app, and raises your cleared board as a trophy once you solve it. On iOS 27 it goes extra-large and fills the screen. Miss a day and you get one free repair a month, because life happens.
Free, alwaysGame Center leaderboard Lowest move count wins
Seasons
A season is a dated run of boards that opens one a day and then stays yours forever. Autumn is the first: fifteen boards from October 1, built around one new tile, with warmer paper, leaves drifting past the board and a cascade tuned to a minor key.
The leaf loses a number every time a placement resolves. Flip it while it still stands, or let it reach zero, fall, and wall that square off for good. Every board is certified the same way the campaign is: par exact, witness stored, and the leaf proven to matter.
One leaf, one placement at a time, and the move after zero drops it. A fallen leaf is a stone: it never flips again, and nothing cascades through it.
One board a day, October 1 to October 15.
Every board is free for everyone while the season runs, unlocked or not. When it closes the pack joins the full game, and anything you opened stays yours either way.
The flex
One-Shot hands you a dense board and a single tile. Bombs, wormholes and rollovers turn the obvious placement into a trap. Find the one that beats the board's certified best, then share the whole cascade as a looping GIF from the win screen.
Every board is a link. Send one to a friend and they can play the exact same puzzle, no install required.
The feel
Chunky ceramic chips that flip with real weight. Marimba notes that climb as the chain grows, haptics choreographed to every topple, and a slow-motion finale when the whole board goes.
Native from top to bottom. No game engine, no cross-platform framework, no third-party code at all. That is how the whole game fits in 3.3 MB and opens instantly.
The whole picture
Privacy
Not anonymised analytics. Not crash reports. Nothing. There is no account, no advertising identifier, and no network request the game makes on its own. Your progress lives on your device, and in your own iCloud if you turn it on.
The App Store privacy label reads Data Not Collected, because there is genuinely nothing to collect. Read the full policy.
The deal
Free to start.
Two worlds and the Daily Flip cost nothing. One purchase, $4.99, opens everything else and keeps it open: no subscription, no second product, no ads, no season pass. Worlds seven and eight arrived free after launch, and every future world and pack is included too.
What the one purchase opens
Already bought it? You keep everything, plus the Founder icon. What free gets you.
