I only play games when I'm travelling. That usually means a plane with no signal, so anything that needs a connection is out. I also can't stand games that throw an ad at me every 30 seconds.
The rules are simple. It has to work offline, the mechanics have to be simple and interesting, and ads are only okay if they don't interrupt play, get blocked by Pi-hole, or only show up when you're online. I lean towards solo developers. Yiotro is the gold standard for me: no ads, no microtransactions, just good games. If you know another developer like that, tell me.
The list
| Game | Offline | Ads | Store |
|---|---|---|---|
 Opacha-mda | Yes | None |  |
 Antiyoy Classic | Yes | None | |
 Mindustry | Yes | None |  |
 Baba Is You | Yes | None | |
 Battle for Wesnoth | Yes | None | |
 SuperTuxKart | Yes | None | |
 SuperTux | Yes | None | |
 Frozen Bubble | Yes | None | |
 Anuto TD | Yes | None | |
 Snes9x EX+ | Yes | None | |
 Alto's Adventure | Yes | Optional | |
 ABC Kids | Yes | None | |
 Level Devil | Yes | Online only | |
 Red Ball 4 | Yes | Yes | |
 Kingdom Rush | Yes | Yes | |
 Tactical War (was Tactic Defense) | Yes | Yes | |
 Tactical War 2 | Yes | Yes | |
 Warlings 2 | Partial | Yes | |
 Sokoban Original & Extra | Yes | Yes | |
 2048 (AndroBros) | Yes | Yes | |
 Risk of War: Wartime Glory | Partial | Yes | |