Antidomino Snaky Loop app for iPhone and iPad

Find a loop in the disk that follows the snake rule and returns to its starting position after passing through some numbered squares. Each grid can only be used once in the circuit at most. The circuit cannot touch itself (including the diagonal direction). The space occupied by the circuit can exactly hold all the given dominoes, and the numbers in each row or column cannot be repeated. The numbers within one grid and its adjacent eight grids cannot be repeated. The peripheral prompt numbers indicate how many cells in the row or column belong to circuits, as well as the sum or product of all the values belonging to circuit cells