…fuck, I went full nostalgia. I used to play something similar but simpler in my childhood, we [my classmates and me] knew it as “território” (territory). It’s like this:

• Two players. Each with a pencil and a piece of coloured chalk (“borrowed” from the blackboard).
• Board: initially we used the back of someone’s maths notebook, for the grid. Then maps copied from the Geography book. Then handmade “maps” with 100~200 territories.
• Each player chooses a territory to begin with, and places their token (the piece of chalk) there. Good spots are close to the centre.
• Players take turns. On your turn, you need to strike the territory below your token, and move it to an adjacent blank (non-striked) territory.
• If you can’t move your token, you lose.
• If the other player proves that they have more turns than you, because your “free area” is considerably smaller than theirs, you lose.

In a hindsight the game was extremely shallow, but it was fun for a bunch of bored 8~10yos to play between classes.