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If you prefer to stay completely offline and don't want to run a server emulator, you can use mods designed for the game's built-in Offline Mode. Nexus Mods: Search for the Offline Experience or similar "Unlock All" mods on Nexus Mods Simple Mod Framework: Most modern mods require the Simple Mod Framework to install correctly. Install the Framework. Download your chosen "Unlock All" mod. Import the mod into the Framework and click Apply Changes Option 3: Manual "Cheat" via Cheat Engine hitman 3 unlock all weapons mod link
For players looking to skip the grind in Hitman 3 (World of Assassination) : If you prefer to stay completely offline