Cave Digger 2: Dig Harder (Steam key / Region Free)

https://store.steampowered.com/app/1523510/Cave_Digger_2_Dig_Harder/

Cave Digger 2 is an action-adventure game in wildland valleys where you explore old mines, nautical caves and ruins of ancient civilizations inspired by western, dieselpunk and Lovecraftian themes.
Supports co-op with up to four players.
Welcome to New Frontier.

Activating the steam key

1) You must download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed).
2) Create a new account on Steam or go to an existing one.
3) Select "Activate via Steam ..." in the "My Games" section, and enter the key received after payment.
4) After activation, the game will appear in your list of games and you can install it.

Please leave feedback after successful activation of the game.