Casual puzzle games are usually described as offline games, which is half true. The board runs locally; the events, the ads and the progress sync do not, and those are what consume a data allowance.
What works with the connection off
The puzzle itself is computed on your phone, so ordinary levels play normally in aeroplane mode. In most of these games you can also spend lives you already have, use boosters already in your inventory, and progress through the map you have already downloaded.
What stops working is anything shared: team features, leaderboards, timed events, cloud saving, and the advertising that funds the free tier. Some games will let you play offline indefinitely and reconcile progress later; others insist on a connection every few levels to validate what you did.
Where the data actually goes
The level itself is a few kilobytes of state. The data consumption in this genre comes from three places, in roughly this order.
- Advertising. A rewarded video is a video: tens of megabytes each on a good connection, because the ad network serves the highest quality your link will carry.
- Content updates. New episodes, seasonal art and event assets arrive as downloads, and in some titles these are large and frequent.
- Sync and telemetry. Small, constant, and negligible next to the first two.
If a game is eating a data allowance, the cause is almost always the first item on that list. Declining rewarded videos removes most of it immediately, and it costs nothing except the reward you chose not to take.
Practical setting for a limited plan: allow the game to update over Wi-Fi only, and decline rewarded video on mobile data. Both are controlled from the phone rather than from inside the game, so no game can override them.
Restricting a single game rather than the phone
Both platforms let you cut mobile data for one app without touching the rest.
- Android. Settings, then Apps, choose the game, then Mobile data. Turning off background data and unrestricted usage keeps the game to Wi-Fi for downloads while still letting it work in the foreground.
- iOS. Settings, then Mobile Data, scroll to the app in the list and switch it off. The game then works only on Wi-Fi, which is blunt but effective.
Automatic app updates are separate again, and on both platforms they can be limited to Wi-Fi in the store settings. That single change usually does more for a data allowance than anything inside a game.
Roaming and travel
Worth a specific note for anyone taking a phone out of New Zealand. Rewarded video and event assets do not know or care that you are roaming, and a game that costs nothing at home can be expensive abroad. Turning off data roaming entirely and playing on Wi-Fi is the simple answer; the puzzles keep working, only the shared features pause.
Storage, which is the other quiet cost
These games grow. A title installed at a few hundred megabytes can reach several gigabytes after a year of seasonal content, most of which is art for events that have already finished. Clearing the cache is usually safe and often recovers a surprising amount; clearing storage or data is not, because on games without cloud saving it can take your progress with it.
Before clearing anything, check whether the game has your progress attached to an account or only to the device. That distinction matters more than the storage saved, and it is worth knowing before you need it rather than after.