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 for 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.