Offline puzzle games that do not need wifi

A puzzle game that does not need wifi is one you can open in airplane mode and play immediately, not one with an offline mode you have to find first. These do, once installed. Where a game has a condition, it is written next to it.

• Hazard Heights. Physics block stacking in portrait, a few minutes a round. Offline play in Hazard Heights comes with Hazard Heights Unlimited, the one-time full-game purchase. Free play needs a connection to start a run, so runs can count on the leaderboards. Offline runs do not rank; your progress syncs when you are back online.
• Threes. Slide numbered tiles, merge them, keep going. Fully offline.
• Mini Metro. Draw a subway map that keeps up with the city. Fully offline.
• Monument Valley and Monument Valley 2. Short, offline, finishable in an afternoon.
• Baba Is You. Rule-rewriting puzzles, hundreds of them. Offline.
• Really Bad Chess. Chess with random pieces. Offline, and better than it sounds.
• Good Sudoku. Offline, with a proper hint system.

How to check before you need it

• Turn on airplane mode at home and open the game. If it shows a login screen or a spinner, it needs the network.
• Play one full round and close the app, then reopen it. If your progress is there, saves are local.
• If a game is free with ads, check that a failed ad does not block play. Paid games and games with optional ads avoid this.

Questions