I had a different strategy, starting with lots of connections, so I found Russia and China first. Albeit playing with a lot of mistakes.

I just did my first second-hand inference and it was satisfying. Turkey borders Bulgaria and Greece, don't know which is which, but those two both border North Macedonia, which was a correct guess.

In addition to sharing a land border with Brazil and Suriname (via French Guiana), France also shares a land border with the Netherlands… on the island of St Martin/Sint Maarten.

Also, there's a new land border between Canada and Denmark, and not depicted on this map, since the border did not formally come into existence until 2022. https://en.wikipedia.org/wiki/Hans_Island#Resolution