Season 4 Exploration Guide in LET IT DIE: INFERNO's. This article covers the new Floor Selection, how to unlock the floors, how to progress, and notes to consider when exploring.
Table of Contents
Changes with the Exploration in Season 4
Exploration Changed to Floor Selection

From Season 4, you can now choose the floor you want to explore. When exploring with each Body Rank, you can select a floor to play from up to four options.
| Tier | Selectable Floors | |||
| Floor 1 (Body Rank 1) | Mountain's Edge | Mountain's Heart | Iron Peak | |
| Floor 2 (Body Rank 2) | Remnant City | Spire District | Selpucher Tower | |
| Floor 3 (Body Rank 3) | Ocean's Reach | Raging Tide | Grand Malestorm (*) | Earthsea Citadel |
| Floor 4 (Body Rank 4) | Glacial Sky | Endless Frost | Avalanche Valley | Frostbite Heights |
| Floor 5 (Body Rank 5) | Flaming Fields | Furnace Grounds | Great Scorch | Blazing Trance |
| Floor 6 (Body Rank 6) | Death's Passage | Skeletal Grove | The Mortal Cycle | |
* "Iron Peak" is unlocked after clearing "Skeletal Grove", while "Grand Malestorm" is unlocked when the total donations to the Raiders Fund reach 50 million Kill Coins.
You Can Only Select the Same Tier as Your Body Rank

During Exploration, you can only select floors from the same tier as your Body Rank. For example, with Body Rank 2, you cannot select floors from Tier 1 or Tier 3 and above; you must choose a floor from Tier 2. If you want to play on a different floor, you should explore after a Body Rank reset.
Resets After Clearing Body Rank 6

Just like in Season 3, your Body Rank increases by one each time you survive a floor. Surviving at Body Rank 6 counts as a full clear and your Body Rank will be reset. The rule that your Body Rank also resets upon death remains unchanged.
How to Progress Through Floors
Connections Between Floors

The floor you have cleared determines which floors you can choose next. Please see below for the connections between floors.
Higher Difficulty in Higher Floors

Floors displayed on the right side of the selection screen tend to be more difficult. While you don't have a full set of equipment yet, it's easier to clear the floors on the left.
Boss and Max SPLithium Changes by Floor

Each floor determines which boss appears and the maximum amount of SPLithium you can hold. The lower the tier, and the further to the right a floor is on the selection screen, the stronger the bosses tend to be and the greater the maximum SPLithium you can hold.
Notes for Clearing the Floors
How to Identify Cleared Floors

For floors you have survived before, the maximum SPLithium you obtained will be displayed on the floor selection screen. Use this when you want to play a floor you haven't cleared yet, or when you want to set a new record for maximum SPLithium.
Check the "Caution" Section

The "Notice" section on the floor selection screen shows information such as increases or decreases in Yummies, the amount and tendency of Yuckies that will appear, and whether NPC Raiders will be present. This greatly affects the difficulty of Exploration, so be sure to check it when selecting a floor.
Timothy