An old rusty key found deep in a cave, what could it open?
Explore a dense world, fight ferocious enemies, and solve puzzles in search of answers.

Master key features:
Item based exploration
Dozens of enemies
Shops, weapons, and powerups
Dungeons
Between 5 and 20 hours of content
Lots of secrets
No language support!

The game doesn't hold you by the hand, it's a love letter to hiking and exploration. You have to find your own path and nothing is story-gated.