| Level/branch name | Location | Method of access | Probability of occurring | Comments |
|---|---|---|---|---|
| Elemental Planes | D1 | Go up with the Amulet | 100% | |
| The Gnomish Mines | D2-4 | Stairs down | 100% | Slash'EM has a new Mine King level, one level below the Mine End level which also exists in vanilla Nethack. |
| Mall | D5-6 | Normal dungeon | 75% | |
| Oracle | D7-9 | Normal dungeon | 100% | |
| Sokoban | One level below Oracle | Stairs up | 100% | |
| Rats | D10-11 | Normal dungeon | 50% | |
| Kobolds | D11-12 | Normal dungeon | 50% | |
| Grund's Stronghold | D12-13 | Stairs down | 100% | |
| The Quest | D15-19 | Portal | 100% | Until you complete the Quest, you will get a message every time you enter the level with the Quest portal. |
| Lawful Quest | D15-19 | Portal | 100% | Kill Nightmare to get Nighthorn and the Key of Law. |
| Neutral Quest | D15-19 | Portal | 100% | Kill the Beholder to get the Eye of the Beholder and the Key of Neutrality. |
| Chaotic Quest | D15-19 | Portal | 100% | Kill Vecna to get the Hand of Vecna and the Key of Chaos. |
| Storage room | D19-26 | Normal dungeon | 66% | |
| The Wyrm Caves | D20-21 | Stairs down | 100% | |
| The Big Room | D20-26 | Normal dungeon | 15% | |
| The Lost Tomb | D21-24 | Stairs down | 100% | |
| One-Eyed Sam's Market | D22-23 | Portal | 100% | Messages like ``Food rations? Only 900 zorkmids.'' indicate that the portal to the Black Market is on your level. |
| Nymphs | D23-24 | Normal dungeon | 45% | |
| The Spider Caves | D26-29 | Stairs down | 100% | |
| The Guild of Disgruntled Adventurers | D26-31 | Normal dungeon | 50% | |
| The Sunless Sea | D28-31 | Stairs down | 100% | |
| The Temple of Moloch | D32-35 | Stairs down | 100% | |
| The Giant Caverns | D32-35 | Stairs down | 100% | |
| Medusa | 1-4 levels above Castle | Normal dungeon | 100% | |
| Castle | D42-47 | Normal dungeon | 100% | |
| Valley of the Dead | G1 - one level below Castle | Normal dungeon | 100% | |
| Juiblex | G2-6 | Normal dungeon | 100% | |
| Yeenoghu | G2-6 | Normal dungeon | 100% | |
| Orcus | G2-6 | Normal dungeon | 100% | |
| Demogorgon | G2-6 | Normal dungeon | 100% | |
| Vlad's Tower | G3-12 | Stairs up | 100% | |
| Frankenstein's Lab | G3-12 | Stairs up | 100% | |
| The Wizard's Lair | G7 | Normal dungeon | 100% | The Wizard's Tower consists of three levels. This is the location of the top level, where he is. |
| Baalzebub | G10-15 | Normal dungeon | 100% | |
| Geryon | G10-15 | Normal dungeon | 100% | |
| Dispater | G10-15 | Normal dungeon | 100% | |
| Asmodeus | G10-15 | Normal dungeon | 100% | |
| Two fake Wizard's lairs | G10-15 | Normal dungeon | 100% | One fake lair has a portal to the inside of the real Wizard's Tower. |
| Vibrating Square | G16 | Normal dungeon | 100% | |
| Moloch's Sanctum | G17 | Perform invocation | 100% |