While you cannot hack your XP level directly because of server-side checks, you can effortlessly manipulate your bank account. Having infinite Merces allows you to buy every legendary weapon and tool in the game, drastically speeding up your mission clear times and XP yield.
If you prefer not to use third-party software but still want an advantage, you can exploit the stock market laptop in the Safehouse vault, which unlocks at Mastery Level 16. hitman 3 freelancer mastery cheat
Start a campaign and play normally until you reach a mission. While you cannot hack your XP level directly
When you reload the game, you will be back at the safehouse with all the massive XP you just earned, but the mission will be reset! Start a campaign and play normally until you reach a mission
to the main menu to force the cloud servers to save your newly acquired fortune.