ParasDoorPredictions

Special Rooms

Fountain, story, and miniboss rooms are only offered (on the exits) once per run. Rooms marked with F have a chance to be forced as described below. Rooms marked with Y are not forced, but are eligible. Unmarked rooms are ineligible.

Tartarus

Chamber Number Fountain Bouldy MidShop MidBoss Thanatos Survival
2            
3            
4            
5 Y          
6 Y Y F      
7 Y Y F F    
8 Y Y F F   Y
9 Y Y F F   Y
10 Y Y Y F   Y
11 Y Y Y F Y Y
12 Y Y     Y Y

Asphodel

Chamber Number Fountain Euridice MidShop MidBoss Thanatos
17          
18   Y     Y
19 Y Y F   Y
20 Y Y F F Y
21 Y Y F F Y
22 Y Y   F Y

Elysium

Chamber Number Fountain Patroclus MidShop MidBoss Thanatos
27          
28          
29 Y Y F   Y
30 Y Y F F Y
31 Y Y F F Y
32 Y Y F F Y
33 Y Y   F Y
34 Y Y     Y

MidShop

The MidShop in each biome can only be offered on the exit of 2 or 3 exit rooms. The MidShop is never offered on the exit of the following rooms:

Room Selection

For each exit, the game:

  1. Checks for any rooms that are eligible to be forced (F) at the next room’s depth. The chance of a room being forced is 1/N, where N is the remaining number of depths at which the room is eligible to be forced. For example, Elysium MidBosses have 1/4 chance at depth 30, 1/3 at 31, 1/2 at 32, and 1/1 at 33.
  2. Picks one of the forced rooms at random (if any) and offers it.
  3. If no rooms are forced (ie. none are eligible or all fail the roll to be forced), finds all rooms that are eligible at the next room’s depth (including those eligible to be forced).
  4. Picks one of the elgible rooms at random and offers it.
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