Tools like SmokeAPI or CreamInstaller replace or modify the game's interaction with the platform's DRM (Digital Rights Management). By intercepting the request that checks for DLC ownership, the tool sends a "purchased" signal back to the game.
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Using an unofficial DLC unlocker is never 100% safe. Because Mortal Kombat 1 is an "always-online" title for most of its progression, the risks are higher than in purely offline games. acidicoala/SmokeAPI: Legit DLC Unlocker for Steamworks Tools like SmokeAPI or CreamInstaller replace or modify
Some advanced mods interface directly with the game's inventory files. Modders like thethiny have developed web-based and local tools that can unlock everything from brutalities to announcer voices by modifying character flags in the game's configuration files. The Risks: Is It Safe? Using an unofficial DLC unlocker is never 100% safe