Party of Four coop variant by Geek Gamers

About Dungeon Drop, from BoardGameGeek:

Gather your gear and prepare to dive into the labyrinth! Teeming with untold treasure, the tunnels are said to be inhabited by unusual creatures, both adorable and terrible. Keep your wits about you as the very walls shift in the torchlight... ...it's time to drop into the dungeon! Dungeon Drop is a lightweight dungeon crawler for 1-4 players, featuring a novel spatial element that assures no two games could possibly be the same. At the start of each game, cubes of varying colors, which represent both loot and monsters in the dungeon, are dropped onto the table from a height of 6 to 12 inches. This creates a dungeon layout with infinite possibilities. You then use your customized hero to explore the dungeon, use your unique abilities, and ultimately loot a room that won't kill you! -description from the publisher