Even in ostensibly single-player games, some developers embed lightweight anti-tamper (e.g., Denuvo Anti-Cheat, EA Anti-Cheat). These run at kernel level and block ReadProcessMemory calls.
If you are using a Steam Deck or Linux, the trainer often fails because it is running in a different "prefix" (simulated Windows environment) than the game. fling trainer game not detected
However, version conflicts are only part of the equation. A more complex layer of interference arises from digital rights management (DRM) systems and anti-cheat software. Many modern titles utilize platforms like Steam, Epic Games Store, or third-party DRM like Denuvo. These systems encrypt the game's executable file to prevent piracy. When a game is launched, the DRM may "unpack" the game in memory differently than the trainer expects. Furthermore, games with built-in anti-cheat engines (common in multiplayer titles, but increasingly present in single-player games) actively scan for external software trying to interact with the game's memory. This tug-of-war often results in the trainer being blocked from reading the game process, leading to a detection error or an immediate crash. However, version conflicts are only part of the equation