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Object: click on each star and turn them into arrows. Each arrow can point either up/down left/right or diagonally. If a cell has #5, that means 5 arrows must point to it. Suppose you're in the middle of the game and that cell is now a 2. That means that 3 arrows are pointing at it & it needs 2 more arrows.
If a cell has a -1, that means that one too many arrows are pointing at it. When all the cells are 0, you have solved the puzzle.
EXCELLENT JOB by Robert Carver of Wilaman Puzzles