When looking for a "Signed" Mod APK, it refers to the digital signature of the file:

Magic Camp Defense is an offline tower defense strategy game developed by Cantalooza Games LLC where players lead a team of fantasy heroes to protect their city from waves of enemies. While "Mod Signed APKs" are popular in third-party communities for unlocking premium features, users should prioritize security when downloading modified files.

Access to premium heroes (like the Ghost Ship or Phoenix) without making in-app purchases.

While the original game is praised for having few forced ads, mods often remove them entirely. Installation Guide

A variety of fantasy heroes can be recruited and leveled up to strengthen your defense. Signed APK vs. Unsigned APK

Downloading modified APKs from unofficial sources carries security risks, including malware or data theft. For the safest experience, use the official version on Google Play or the Apple App Store . Magic Camp Defense - Apps on Google Play

Go to your device Settings > Security and allow installation from "Unknown Sources."