doukutsu-rs

doukutsu-rs emulates Cave Story. It reads 1 file, none of them required: it starts games without them.

About this profile

Detail	Value
Type	standalone + libretro
Classification	Game engine
Source	https://github.com/DrGlaucous/doukutsu-rs-nm
Upstream	https://github.com/doukutsu-rs/doukutsu-rs
Version	0.102.0, stated in Cargo.toml
Revision	DrGlaucous/doukutsu-rs-nm@51e64c2e9615, doukutsu-rs/doukutsu-rs@d05995b2ce88
Profiled	2026-03-23
Profile	YAML, JSON
Cores	doukutsu_rs
Systems	Cave Story

Technical notes

No BIOS or firmware files required in the system directory. The core reads game data from a data/ subfolder next to the loaded content. Users must provide the Cave Story freeware game files (Doukutsu.exe and its data/ directory) or a Cave Story+ installation as the content to load. All engine-internal resources (fonts, wavetables, controller mappings) are built into the core binary.

Files

1 file: 0 required, 1 optional.

By kind: 1 game data.

In this collection: 1 in repo and 0 missing.

Game data

Doukutsu.exe optional in repo game data

Freeware Cave Story executable, loaded as content

• Read from: the folder of the loaded content, not the BIOS directory
• System: Cave Story
• The engine reads the game from the data/ folder in the same directory. On first run it extracts the Organya music, bitmaps and stage table from it into data/, unless data/stage.sect already exists.

• Collection copy: nxengine/Doukutsu.exe in the nxengine data directory

Source

• Asked for by: emulator code, libretro port
• Source: drsretroarch/src/core.rs:51-52 (emulator code, libretro port), drsretroarch/src/core.rs:226-233 (emulator code, libretro port), src/game/shared_game_state.rs:366-384 (emulator code, libretro port), src/data/vanilla.rs:37-97 (emulator code, libretro port)

Next steps

• Get your files, for the setup you play on
• Every system, and the files each one needs
• When a game does not start

Data as of 4 November 2026.