A friend passes you a note with the following strange image.

She explains that several of the letters can be morphed
from one to another without adding new edges,
joining new points together, or cutting edges apart.
For example, the A and E in her note can be morphed back and forth
because both contain exactly one loop joined with an edge.
**Can you decode the number pairs by identifying groups of letters than can
be “morphed” from one to another?** Try writing each group in alphabetical
order on the corresponding rows of the grid…

Like in the example above, MaPP puzzles are **fun** challenges
which get students learning and using **mathematics** and
**problem-solving skills**, by engaging them with mathematical ideas outside the
usual arithmetic-to-calculus sequence.

## More Puzzles

MaPP open-sources its game books for use by anyone under a Creative Commons license. PDFs of previous game books are available at the following links.

- Challenge ‘18
- High School Challenge ‘17
- High School Challenge ‘16
- Lamar Mathematical Puzzlehunt 2015

## Contributing a Puzzle

Want to write a puzzle for MaPP! Click here to learn more.