**Eulero** (*"Graeco-Latin Square"*, *"Euler Square"*) is a puzzle with letters and digits. The goal is to fill in the grid with symbols according to the following rules:

- Each cell contains one letter and one digit.
- Every row and every column contains each letter and each digit exactly once.
- No two cells contain the same pair of symbols.

**Cross+A** can solve puzzles from **3 x 3** to **7 x 7** (Graeco-Latin square **6 x 6** does not exist).