Tercet Puzzle

Tercet is a numbers game played on a grid. One digit is the sum of the others: the cells go. THE RULE Link neighbouring cells — in a line, along a diagonal, or bending at an angle. The path crosses freely over cells that are already empty. If the digit at one end equals the sum of all the others, they disappear. Empty the whole grid to win. TWO WAYS TO PLAY Snake: the chain is any length, three cells or ten. The longer it runs, the more it scores. Trio: exactly three cells. Shorter, sharper, quicker. THE LIFEBUOY Every grid can be emptied — but the order of the moves can lose the way out. When no move is left, a lifebuoy winds the game back to the last playable moment and hands the grid back untouched, one breath before the mistake. One to start with, one more for every grid cleared without spending any. WHEN IT ENDS No lifebuoy left, and the game stops. It then shows the way out that…