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I download the unexplored tiles kml, convert it to gpx and then upload that to gpxeditor.co.uk (which I pay the subscription for), looks like this:-
That means I can plan the route on that site and make sure I go in all of the tiles I want. I've also got a script to clean up the converted kml->gpx file so that it just has one box for each area of unvisited tiles:-
Although it's easier to miss a specific tile if I use this for planning, I always go back and check the route on the first one to check every tile I want is visited.
(Haven't done any tile bagging for months due to injury and now lockdown, will aim to get back out when I get some cycling fitness back.)
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That's the routes tab in veloviewer, plus this plugin for Chrome:
https://chrome.google.com/webstore/detail/veloviewer-strava-plugin
The plugin also shades tiles and overlays the grid in the Strava route planner, so you can see how far along that farm track you actually need to go before you risk having some nimby ranting about footpaths at you.
I'm up to 21x21. Revisited some of the routes I'd planned. Done a couple of tile-oriented rides in the last month or so.