Golden floor

The 60ft x 60ft room is made of perfectly interlocked golden coins. The walls are made of ornate stone carvings depicting kings and gods, decorated with trim made of precious metals. There is a door on the other side of the room made of gold with a relief depicting many face of famous rulers and gods, each with their eyes set deeper in the door than the rest of the relief.

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''A DC 15 religion or history check identifies the Gods or Kings as wise rulers, and can identify at least half the faces on the door. A DC 20 reveals the depictions to be imparting cautious wisdom directly to their followers, and 75% of the faces on the door.'' =====

THE SOLUTION
If a coin is inserted into at least one eye for 5 of the 10 faces on the door, the floor is reset and everyone is teleported to the middle of the new floor. All taken coins are removed from any player's inventory.

The solution requires the players closely observe each coin, paying attention to the depictions of the 10 different faces. Each face depicts either the left or right side of the face, the coins need to match up with each face and the correct side of the face depicted in order to unlock the door.

DC 10 PER or INV - the top layer of gold coins are easily pried apart and removed.

DC 15 INV or INS - the face's eyes are depressed in a circular relief, about the size of a gold coin.

''DC 20 INV or INS - the gold coins on the floor are arranged in a very particular pattern in 15 ftx 15 ft areas. The 10 different faces match the rulers and gods as depicted on the walls, and depicted on the doors.''

THE FLOOR
Golden floor is suspended by chains, in a grid of 15ft x 15ft squares. The floor appears to be perfectly flat and stable unless more than 500 combined lbs of weight is put on a single grid square, triggering the pit trap as described below and destabilizing the floor.
 * Removing more than 10 GP visibly destabilizes the floor, and the floor begins to sag and bounce like a trampoline.
 * For every 20 GP removed, the player with the most removed gold triggers a pit trap in the grid they're standing.

DC 20 INV or INS - A player may remove 10 GP without destabilizing the floor by recognizing the patterns on the floor and removing only one coin depicting each ruler/god, spaced every other 15 ft x 15ft grid with 2 other grids from the corners.
 * If 50 total gold is removed, the floor destabilizes and the inner 4 grid collapse.
 * If 10gp is removed from any remaining golden floor grids, they collapse as well.

DC 25 INV or INS - A player can safely remove 20 GP without destabilizing the floor, removing two coins per each coin depicting a ruler/god, one each grid plus four others from the corners.

DC 30 INV or INS - the patterns are a complex mathematical layout, each coin is sized slightly different from one another and they form a matrix of structural integrity, you would estimate no more than 20 GP could be removed without the floor potentially collapsing.  Intentional collapses can net a fair amount of gold, 100 GP or more."GOLDEN FLOOR PIT TRAP""DC 20 DEX save, success avoids. 25ft pit with spikes (2d10 falling + 2d6 piercing)"