Hidoku

A numbered trail fills the grid. In Hidoku, blank spaces sit between fixed digits, with the first and last values marked by a ring. Place every missing number once, linking consecutive values across neighboring squares in any direction, including diagonals. The layout may shift in size or shape, and the full chain must pass through every square without revisiting one. Only one arrangement fits the whole board.

How to play?

Select an empty square and enter the value you want to test there. Tap a guessed square again to remove the number when a choice doesn't fit. The number line at the bottom changes the active value before placement. Drag up or down on the background to cycle through digits, or tap the enlarged square to switch between the next and previous number.