https://store.steampowered.com/app/1044980/Mech_Mechanic_Simulator/
Become a Mech Mechanic to deconstruct, rebuild, paint and fix gigantic iron machines. You live in an age of enormous machines and you better get ready to get your hands dirty!

INSTRUCTION FOR ACTIVATION:

1. You must download and install Steam http://steampowered.com/download/SteamInstall.msi
2. Log in to your account or register a new one.
3. Go to the "My Games" section and select "Activate via Steam ..." and enter the key received after payment.
4. After activation, the game will appear in the list of games (Library) and you can download it