Scott, a young man from Manhattan, finally pops the question to his girlfriend... who promptly says "no."
He's so dejected that he accidentally drops the ring he used to propose into a storm drain.
The ring keeps falling deeper and deeper underground. It falls into the sewers, then further down into... a movie theater?
Wait, is that a jet plane? Why are we in the Old West now? What are cowboys doing underground???
Turns out that deep below Manhattan , there's an underground dungeon where America's past lives on!
Will Scott be able to traverse it deep enough to find his ring?

-Explore America's history... turned into a dungeon!
This weird dungeon is a collection of the culture and memories of decades past.
The golden age of cinema, the space race, the Old West...If you want to take a taste of America's past, UNDERGROUNDED will offer you a full-course dinner.So, what's your favorite decade?

-Get through puzzles with a trusted ally!
Do you think America's history is too much for one shy Manhattan boy (or for an inexperienced gamer) to tackle on his own?
Worry not! You have a great ally on your quest: a talkative, cheerful canary!
If a puzzle has got you stumped, listen to your bird friend. He might just have the hint you need.

-Get back what you've lost!
Scott isn't the only one who found his way into the underground dungeon.
A lot of different people who have lost something are there to find it too.
Help them out and maybe, just maybe, that will help Scott's life change for the better as well.

-Defeat enemies with retro games!
Right, I forgot to mention one thing. There are terrifying, powerful bosses waiting for you in the dungeon!
But don't despair: Scott has a mysterious power. If he finds a retro game cabinet and plays it, strange things happen in the world around him!Play several nostalgic homages to '80s arcade masterpieces to find a way to defeat those bosses!