Well, the number indicates the number of object tiles (monsters, weapons, food, etc.) in the vicinity, and while the color of the number is influenced by the object tiles found nearby, the number itself is not affected. For example, if there’s an orange number 2 (surrounded by yellow and red tiles—a monster), and you find the monster, the color changes to yellow (with the red removed). Since the number remains 2, it becomes “yellow 2,” and I thought this might be confusing. You’ll get the hang of it after trying it a few times!