Solving Strategies
- For each region: Think about what possibilities exist and write these possibilities down, e.g. 1 = 4 − 3 = 3 − 2 = 2 − 1.
You can make annotations even in the online game. Learn more here.
- If the regions are greater than two cells: Do all your considerations on a systematic basis to be sure to find all possibilties for the region.
Make small annotations inside regions if you know which numbers there must be but you don't know the exact order. This can help you to solve other cells outside that region.
Learn here how to make and move annotations.
