My Two Cents
There’s an item you can get in Super Win the Game called ‘The Underworld Ticket’. To get this item you need to have at least 50 gems, which you can get pretty easily by going through the different dungeons in the game. Once you have done this, go to the village, which is two tiles wide, and buy the skeleton key. This will grant you access to the spooky underworld.
Grab ‘n’ Go
This is one of the few missable achievements. So, if you’ve missed it already, you’ll need to start a new game. Play the game as normal, but, when you get to the key, collect it and then go left until you come back to the starting area and go left once more. That’s it! Achievement earned!
On the subject of grabbing things, you can grab this game from the Steam Store here!