Offline puzzle games for long flights: what to look for
Offline puzzle games for long flights: what to look for, how to pick board size, and how to save your place without wifi.
The phone leans against the seat back, and a 9x9 grid lies open on the tray table. The seat belt sign has just turned off, the cabin lights are dimmed, and the flight has about six hours to go. Before touching it, the traveler glances at the board for a moment.
The grid has 81 cells, split into nine boxes that are each three cells wide and three cells tall. Each row, each column and each box must contain every number from 1 to 9 exactly once. The traveler fills in the empty cells by checking which numbers are still missing, since some cells are already filled.
There is no signal for most of this flight. The puzzle has to run from data already stored on the phone, because Wi-Fi is either unavailable or too slow to load anything. At 35,000 feet, a board that stops to fetch a new level or waits for a connection before saving a move is of little use. Without asking for anything from outside the cabin, the traveler needs a game that opens, loads the grid and accepts each number.
Puzzle types that need no connection
Logic puzzles and number grids are the easiest types to play without a signal, because the rules and the answer checking can both live on the phone. To check for errors, a solver only looks at whether a row, column or box repeats a number, and no server is needed for that. The 9x9 number grid first appeared in print in the May 1979 issue of a US magazine, under the name Number Place. People solved it with pencil and paper for years before any app existed, so it works without outside help.
Nonograms are another good choice. Two puzzlers, Non Ishida in Japan and James Dalgety in Britain, invented them separately in 1987. Each row and column has numbers beside it that give runs of filled cells, with at least one empty cell between each run and the next. Players work out where the runs can fit and mark the cells, and the picture shows up with no online check.
Before boarding, travelers can check the game's App Store listing to see how it works offline. The listing is where to look for whether a game needs a connection to load new levels, sync progress or show ads. At the gate, opening the game once in airplane mode also shows whether it starts and saves a move.
Matching board size to a flight leg
One level of a 4x4 board, with its 16 cells, usually takes a beginner a minute or two. A 6x6 board has 36 cells and often takes five to ten minutes. With 81 cells, a 9x9 board can take 20 minutes or more, depending on how many numbers are already filled in. Those lengths decide how many boards a player can finish on a leg where the tray table stays down for most of the trip.
Picture a player with two legs in one day, as a hypothetical example. On the first leg, which lasts one hour, the player plans a single 4x4 board, or a 6x6 board if the first one goes quickly, and leaves time for cabin announcements and the descent. On the second leg, which lasts six hours, the player plans one 9x9 board that should take about 30 minutes, with a break for a meal and a nap in between.
Where the player stops matters more than whether the level gets finished. A good place to stop is right after a row, column or box is complete and every placed number has been checked against the rest. If the player stops in the middle of a half-checked region, the reasoning is hard to remember later, and settled cells may need rechecking before the tray goes up.
Packing a paper backup and resuming a board
In a seat pocket, a small paper grid and two sharpened pencils take almost no room, and they keep the puzzle going when the battery dies or the cabin is too dark for a screen. One sheet printed or drawn with a 9x9 grid is enough, and a spare pencil covers the case where the first point breaks.
Before closing the app or the book, the player writes the board size and the last completely filled row on the back of the boarding pass or in the margin. The next session can start from the same place when the player has written a note such as "9x9, row 4 done", even if the phone was put away for a meal or a nap. Players who write pencil marks, the small candidate numbers in a cell, can keep them light so they erase cleanly.
On the next leg, the player can try one habit: scan one row, one column and one box before placing the first number and keep a pencil in the seat pocket.
FAQ
What offline puzzle games work without wifi on a plane?
Look for a game that loads its levels and checks each entry on the phone itself. The App Store listing usually says if the game needs a connection to load new levels or sync progress.
How big should a puzzle be for a six hour flight?
A 9x9 board with 81 cells can take 20 minutes or more, so a six-hour leg has room for several boards. Players often finish one board, eat a meal, and then start the next.
How do you save a puzzle when the phone battery dies?
Players can note the board size and the last finished row on a boarding pass before they put the phone away. A small paper grid and two pencils in the seat pocket keep puzzle going as a backup.
Was the 9x9 number grid first printed in a magazine?
Yes. Howard Garns submitted the puzzle to a US puzzle magazine, and it appeared in the May 1979 issue.
Sources
NumFall is made by the publisher of this site. Any health or brain-training points here are general information, not medical advice.