If the spot you’re examining is in an invalid position, place a white square on it. Don’t forget about the “it cannot be the same room if it’s the only non-red room both red rooms border with” part of the second rule. Look at the empty spots on your map with 2 or more red neighbors, at least one of which is bright red. Place a white square in spots where a red room cannot be created.Īfterwards, do the same for regular rooms, but in a darker color to make it more distinct. Then, draw the possible neighboring red rooms for each of your special rooms (without looking at the rooms themselves, only look at the map!), besides the boss room. The Binding of Isaac: Rebirth How to Find Ultra Secret Rooms Don’t collect any batteries you find until you’ve revealed the whole map.įirst, printscreen your full map and paste it in paint. Make sure you have a good understanding of how to look for super secret rooms, since they often act as the final piece of the puzzle when it comes to our task. If you don’t have any, just rely on your gut until you’ve full cleared the floor. Having items/cards that reveal parts of the map will help immensely. Now that we know the rules abided by ultra secret rooms, we can start looking at the map of our floor.
Dark red square = red room near a regular room.Bright red square = red room near a special room.Obviously, there are many more possibilities, but these are going to be the most common: The Binding of Isaac: Rebirth How to Find Ultra Secret Rooms Here are some useful examples of valid and invalid locations of ultra secret rooms. If the level generation works as intended, you will only need to create one red room to find the ultra secret room, as it is revealed immediately after you open the neighboring red room. The level usually has 3+ possible spots for an ultra secret room, but if there aren’t any valid spots for these rules to apply, the second rule will be disregarded. Both of these red rooms must be connected to at least one non-red room (but it cannot be the same one if it’s the only non-red room both red rooms border with).At least one of these red rooms must be connected to any special room (treasure room, shop, arcade, regular or super secret room etc)besides a boss room.Under normal circumstances, an ultra secret room will be generated between 2 (sometimes more) red rooms. Since red rooms cannot be created in greed mode, ultra secret rooms are limited to regular runs. The Crystal Key trinket opens red rooms too, but you can’t control it so it won’t be very helpful here. Obviously, the most reliable one the Red Key, but you can also use Cracked Key or Soul of Cain. In order to find an ultra secret room, you will need an item/consumable capable of creating red rooms.
This can be circumvented if you have a trinket that allows those rooms to spawn on late-game floors, like the Wicked Crown or Silver Dollar.
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