Essential Computer Program That Can't Be Altered
This page is the CodyCross answer for the clue below from Games, Group 958, Puzzle 1 (Roguelike Dungeon Crawler).
Question is: Essential Computer Program That Can't Be Altered
and the answer is: FIRMWARE
Word Meaning:
FIRMWARE — (computing) A permanent form of software that provides a low-level control of computing device hardware.
Definitions from Wiktionary.