An offline 3D puzzle for flights, tunnels and dead zones
Cubo builds every board on the iPhone itself. There is no account to create, no level pack to download and nothing to sync, so airplane mode changes nothing about the game.
Free on iPhone. iOS 17.0 or later.
Why it keeps working with no signal
Most puzzle games that claim to be offline still want a connection somewhere: a login, a level download, a leaderboard, a save that syncs. Cubo has none of those pieces, and that is a consequence of how it is built rather than a setting you switch on.
- Boards are generated, not fetched. A round starts by cutting a filled box into connected pieces on the device. There is no catalogue of levels sitting on a server.
- The daily board comes from the date. Cubo turns the calendar date into a number and feeds it to the same generator. Two iPhones with no connection at all still produce the same board on the same day.
- Progress is a local file. Best times per difficulty, the daily streak and your settings are written to storage on the phone.
- There is no account. No sign in screen, no email, no password, nothing to recover.
What works in airplane mode
| Part of the game | With no connection |
|---|---|
| Speed mode | Works. Timer and best time are local. |
| Relaxed mode | Works. |
| Daily puzzle | Works. The board comes from the date, not a download. |
| Streak | Works. Counted on the device. |
| Easy, Medium, Hard | All three generate normally. |
| Sound and haptics | Work. Both can be switched off in Settings. |
| Ads | Nothing loads, so nothing appears. No part of the game waits on them. |
Before a long flight
- Install and open it once on the groundOpening the app once gets the three tip screens out of the way, so your first offline round starts on the board.
- Pick your difficulty before takeoff, or notNothing about the difficulty picker needs a connection either, so this one is only a matter of taste.
- Solve the daily firstThe daily board rolls over at midnight UTC. If your flight crosses that boundary you can solve one board before and a new one after, both without a signal.
Related reading
Offline questions
Does Cubo need wifi or mobile data?
No. Cubo has no account, no login screen and no server. Boards are generated on the iPhone and progress is written to a file on the device, so the game starts and plays with the radios off.
Does the daily puzzle work offline?
Yes. The daily board is derived from the calendar date rather than fetched, so an iPhone in airplane mode produces the same board as everyone else that day, and solving it updates the streak locally.
Do the ads need a connection?
Yes, and that is the practical effect of playing offline: with no connection the banner and the between rounds ad have nothing to load, so you simply do not see them. Nothing is blocked or gated behind them.
Is my progress backed up anywhere?
No. Best times, the daily streak and your sound and haptics settings are stored on the device only. Nothing is uploaded, which also means deleting the app removes them.
Do I need to download levels first?
No. There is no level pack to fetch. The generator builds a new board every time you start a round, so there is nothing to prepare before a flight beyond installing the app.
Install it before you lose signal