In Ground the square a piece stands on decides how it moves: on a + square along rows and columns, on a × square diagonally. Before you play ten games, the board should make two things obvious: which squares are which, and when your marked piece is in danger.
The opening position, three ways.
When an enemy piece could take your marked piece next move, a line runs from it to your piece, in the game's orange, and the status says so. Like check in chess. Only threats against you are drawn, never your own chances: the board doesn't play for you.
Staging