Microsoft Treasure Hunt Strategy Guide
- Introduction and General Strategies
- General Patterns
- Row Patterns
- Corner Patterns
- Specific Patterns
- Level 86 Walk Through
Subtraction is a simple but powerful technique to reduce complex problems into simpler ones. Consider the following case:
2-3-2-1 is not a pattern included in the Guide’s list, but through subtraction we can transform it into one of them. The trap in the upper left influences the counts below, 2-3-2-1. To see what it would be without the trap, we subtract 1 from each flagged adjacent square, resulting in 1-2-2-1. That’s a standard pattern the two traps below the 2’s.
Here’s another messy example:
Here we subtract 3 adjacent flags from the 4, and 1 adjacent flag from the 2, simplifying 4-1-2 to 1-1-1. The single trap is under the 1.
The rule of subtraction is a basic and essential tool for resolving complex puzzles. I cannot emphasize how important this tool is, so here is one more example:
3-3-1-1 becomes 1-2-1-1. The traps are under squares the first and third unexposed squares.