After beating the lamb for the first time a golden door will appear in the starting room of the dark room floor.
Is therea shop on the final floor of greed.
Similar to the donation machine the amount of coins donated will persist between all greed mode runs donating money to the greed donation machine unlocks achievements and items.
The final boss of the dark room will always be the lamb.
Throughout the wasteland you cross bridges and fall down in deep ravines to reach to the castle.
Floor 5 desolate dunes.
Desolate dunes was released in the version 40 update and is the fifth floor in swordburst 2 this floor is given to players when they defeat irath the lion it has a desert canyon theme similar to floor 5 in swordburst online yet ironically contains little to no actual sand.
Up until the penultimate floor an already unlocked treasure room with a silver door frame and a normal locked treasure room are also available.
The greed donation machine appears after every ultra greed fight in greed mode or greedier mode upon touching the greed donation machine isaac will donate a coin causing the displayed coin total to increment.