Cheat Engine is not a virus, but its installer often comes with adware. Always download from the official website (cheatengine.org) and decline optional offers.
Most players use Cheat Engine to change numerical stats. Here is the step-by-step for Experience Scan for Value : Look at your current Gold in-game (e.g., 500). Enter box in Cheat Engine and click First Scan Change the Value Wolf--39-s Dungeon Cheat Engine