This one's inspired by an indie game "Pathway", where you mount expeditions in search of artifacts, kill lots of nazies and zombies, and pray you don't run out of fuel. It's really neat if you're into XCOM-like combat with mild difficulty curve. Ironically, by the time this pic will be posted, I've already grown bored of it. I'm fairly certain 40 hours is way more than what most people give it.

In case you're interested. I suggest waiting until it's on sale though: