How you get here
The ordinary opening chapter. Variant availability depends on save progression.
Prepare before the checkpoint
- Visit the first-floor Treasure Room while its ordinary entrance is unlocked.
- Keep a key for the next floor and avoid spending every bomb before checking useful entrances.
- Room layouts and boss pools differ between the three variants.
Checkpoint and exit
On the standard route, the first ordinary deal opportunity is usually on the second floor. Prepare protection before that boss.
Continue toward Caves, or use an unlocked alternate-path exit when your goal calls for Downpour/Dross.
Random boss pools by variant
These counts come from the supplied boss-pool data. Pool membership and weight do not guarantee an encounter; fixed finales use route rules.
Basement: 11 listed entries
Cellar: 8 listed entries
Burning Basement: 12 listed entries
Enemies worth recognizing
Learn the attack cue before entering a crowded room. These are selected preparation references for this floor family, rather than a complete spawn list.
SpiderAn erratic crawler that rushes nearby targets.
Big SpiderA larger spider that leaves two smaller threats.
Grilled ClottyA fast charred Clotty with slightly angled four-way shots.
NeedleA burrowing lunger whose warning lump can move between attacks.
MulliganA fleeing enemy that leaves flies behind when it dies.
Round WormA burrowing shooter that changes the origin of its next shot.