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- : For more difficult questions, the tools of "Landscape +3" display sum and "Portrait +4" display sum are used to help generate candidate numbers. This feature can increase the completion rate to 90% by isolating a few more numbers.
- Which nine gold is Zhucheng China
- Step 1: Observe first
- : Observation Palace, i.e. a 3x3 lattice. Candidates can be easily found by observing whether there is only one row in some houses. For example, if there are only numbers 3 and 6 in the middle of the house, if the other numbers in the other two rows of a house are already ready, and 6 is killed in the next row, then there must be 3 in this row.
- Step 2: Speculate