diff --git a/README.md b/README.md
index e6fc248..9fffab1 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,14 @@ and examine or modify game variables. There are two ways to use the debugger:
   launch the debugger with a console interface. Type `help` to see a list of
   available commands.
 
+### Streamer Mode
+
+xsystem35 introduces a "Streamer Mode" to make playing games with NSFW content
+safer for streaming or public viewing. When enabled with the `-censor <file>`
+option, images specified in the provided file will be automatically mosaiced.
+
+The `misc/censor/` directory contains example censor list files for some games.
+
 ## Installation
 
 Prebuilt packages for Windows and Android can be downloaded from the
diff --git a/doc/xsystem35.6.adoc b/doc/xsystem35.6.adoc
index 3613a68..faa9233 100644
--- a/doc/xsystem35.6.adoc
+++ b/doc/xsystem35.6.adoc
@@ -49,6 +49,11 @@ finds System 3.x game files (*.ALD) from the current directory.
   Suppress text hook on specified scenario pages. _list_ is a comma-separated
   list of page numbers. Used to suppress system messages, etc.
 
+*-censor* _file_::
+  Enable Streamer Mode, which mosaics specific images to make them safe for
+  streaming. The _file_ is a text file containing a list of image numbers
+  to censor, one per line. Lines starting with '#' are treated as comments.
+
 *-renderer* _name_::
   Use the SDL rendering driver named _name_.
 
diff --git a/misc/censor/README.md b/misc/censor/README.md
new file mode 100644
index 0000000..4f61e66
--- /dev/null
+++ b/misc/censor/README.md
@@ -0,0 +1,21 @@
+# Censor Lists for Streamer Mode
+
+This directory contains sample censor lists for various games, intended for use
+with xsystem35's Streamer Mode.
+
+## Usage
+
+To use a censor list, specify its path with the `-censor` command-line option
+or in your `.xsys35rc` file. For example:
+
+```bash
+xsystem35 -censor misc/censor/kichikuou.txt
+```
+
+The list files contain image numbers (integers), one per line. Lines starting
+with `#` are treated as comments.
+
+## Contributing
+
+We welcome contributions of censor lists for other games! If you have created
+a censor list that you'd like to share, please open a Pull Request.
diff --git a/misc/censor/kichikuou.txt b/misc/censor/kichikuou.txt
new file mode 100644
index 0000000..cac5ae1
--- /dev/null
+++ b/misc/censor/kichikuou.txt
@@ -0,0 +1,164 @@
+# Censor list for 鬼畜王ランス (Kichikuou Rance)
+27
+70
+93
+101
+102
+103
+106
+107
+108
+109
+110
+111
+112
+113
+114
+115
+116
+117
+118
+119
+120
+121
+123
+124
+125
+126
+127
+128
+129
+130
+131
+132
+133
+134
+136
+137
+138
+139
+140
+141
+142
+143
+144
+145
+146
+147
+148
+149
+150
+151
+152
+153
+154
+155
+156
+157
+158
+160
+161
+162
+163
+164
+165
+166
+167
+168
+169
+171
+172
+174
+175
+176
+177
+178
+179
+180
+181
+182
+183
+184
+185
+186
+187
+188
+189
+190
+191
+193
+195
+196
+197
+198
+199
+200
+201
+203
+204
+205
+206
+207
+208
+209
+210
+214
+215
+216
+217
+218
+219
+221
+222
+224
+225
+226
+227
+228
+229
+230
+231
+232
+233
+234
+235
+239
+299
+300
+361
+362
+363
+375
+376
+377
+393
+422
+461
+466
+500
+501
+502
+503
+504
+505
+506
+507
+508
+509
+510
+511
+512
+513
+514
+515
+517
+844
+845
+846
+847
+848
+851
+852
+853
+854
+855
diff --git a/src/cache.c b/src/cache.c
index 75d5d19..788e401 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -130,3 +130,19 @@ void *cache_foreach(cacher *id, int key) {
 	}
 	return NULL;
 }
+
+void cache_clear(cacher *id) {
+	cacheinfo *ic = id->top->next;
+	cacheinfo *next;
+
+	while (ic != NULL) {
+		next = ic->next;
+		if (ic->data) {
+			totalsize -= ic->size;
+			id->free_(ic->data);
+		}
+		free(ic);
+		ic = next;
+	}
+	id->top->next = NULL;
+}
diff --git a/src/cache.h b/src/cache.h
index 53aad16..bac7315 100644
--- a/src/cache.h
+++ b/src/cache.h
@@ -46,5 +46,6 @@ typedef struct _cacher cacher;
 extern cacher *cache_new(void *delcallback);
 extern void    cache_insert(cacher *id, int key, void *data, int size, int *in_use);
 extern void   *cache_foreach(cacher *id, int key);
+extern void    cache_clear(cacher *id);
 
 #endif /* !__CASHE__ */
diff --git a/src/cg.c b/src/cg.c
index 66bd012..9458a5e 100644
--- a/src/cg.c
+++ b/src/cg.c
@@ -21,9 +21,14 @@
 */
 /* $Id: cg.c,v 1.12 2001/09/16 15:59:11 chikama Exp $ */
 
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <SDL.h>
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#endif
 #include "portab.h"
 #include "system.h"
 #include "nact.h"
@@ -41,6 +46,9 @@
 #include "filecheck.h"
 #include "cache.h"
 
+static int *censor_list;  // sorted list of cg numbers
+static int censor_list_size;
+
 /* VSPのパレット展開バンク */
 int cg_vspPB;
 /* cg,palette 展開フラグ (funciotn flag) */
@@ -50,6 +58,8 @@ int *cg_loadCountVar;
 /* Brightness (PD command) */
 int cg_brightness;
 
+#define MOSAIC_SIZE 16
+
 #define GCMD_EXTRACTCG(c)    ((c) & 0x01)
 #define GCMD_SET_PALETTE(c)  ((c) & 0x02)
 #define GCMD_LOAD_PALETTE(c) ((c) & 0x04)
@@ -69,6 +79,46 @@ static void clear_display_loc();
 static void display_cg(cgdata *cg, int x, int y, int sprite_color, bool alpha_blend);
 static cgdata *loader(int no);
 
+static int compare_integers(const void *a, const void *b) {
+	int int_a = *(const int *)a;
+	int int_b = *(const int *)b;
+	return (int_a > int_b) - (int_a < int_b);
+}
+
+static bool is_censored_cg(int no) {
+	no += 1;  // CG numbers are 1-based.
+	if (!censor_list)
+		return false;
+	return bsearch(&no, censor_list, censor_list_size, sizeof(int), compare_integers) != NULL;
+}
+
+static void cg_mosaic(cgdata *cg) {
+	Uint32 format;
+	switch (cg->depth) {
+	case 8:
+		format = SDL_PIXELFORMAT_INDEX8;
+		break;
+	case 16:
+		format = SDL_PIXELFORMAT_RGB565;
+		break;
+	case 24:
+		format = SDL_PIXELFORMAT_RGB24;
+		break;
+	default:
+		SYSERROR("Unsupported cg depth %d", cg->depth);
+	}
+	SDL_Surface *sf = SDL_CreateRGBSurfaceWithFormatFrom(
+		cg->pic, cg->width, cg->height, cg->depth, cg->width * (cg->depth / 8), format);
+	SDL_Surface *tmp = SDL_CreateRGBSurfaceWithFormat(
+		0, (cg->width + MOSAIC_SIZE - 1) / MOSAIC_SIZE, (cg->height + MOSAIC_SIZE - 1) / MOSAIC_SIZE, cg->depth, format);
+	if (sf->format->palette)
+		SDL_SetSurfacePalette(tmp, sf->format->palette);
+	// NOTE: SDL_BlitScaled() does not support 8-bit surfaces.
+	SDL_SoftStretch(sf, NULL, tmp, NULL);
+	SDL_SoftStretch(tmp, NULL, sf, NULL);
+	SDL_FreeSurface(tmp);
+	SDL_FreeSurface(sf);
+}
 
 /*
  * Identify cg format
@@ -230,8 +280,12 @@ static cgdata *loader(int no) {
 	default:
 		break;
 	}
-	/* insert to cache */
+
 	if (cg) {
+		if (is_censored_cg(no)) {
+			cg_mosaic(cg);
+		}
+		/* insert to cache */
 		int size = cg->width * cg->height * (cg->depth / 8);
 		cache_insert(cacheid, no, cg, size, NULL);
 	}
@@ -536,6 +590,10 @@ SDL_Surface *cg_load_as_sdlsurface(int no) {
 	ald_freedata(dfile);
 	if (!cg) return NULL;
 
+	if (is_censored_cg(no)) {
+		cg_mosaic(cg);
+	}
+
 	SDL_Surface *pic = type == ALCG_PMS16
 		? SDL_CreateRGBSurfaceWithFormatFrom(cg->pic, cg->width, cg->height, 16, cg->width * 2, SDL_PIXELFORMAT_RGB565)
 		: SDL_CreateRGBSurfaceWithFormatFrom(cg->pic, cg->width, cg->height, 24, cg->width * 3, SDL_PIXELFORMAT_RGB24);
@@ -562,3 +620,60 @@ SDL_Surface *cg_load_as_sdlsurface(int no) {
 	cgdata_free(cg);
 	return sf;
 }
+
+EMSCRIPTEN_KEEPALIVE
+void load_censor_list(const char *path) {
+	if (cacheid)
+		cache_clear(cacheid);
+	if (censor_list) {
+		free(censor_list);
+		censor_list = NULL;
+		censor_list_size = 0;
+	}
+	if (!path || !*path)
+		return;
+
+	FILE *fp = fopen(path, "r");
+	if (!fp) {
+		SYSERROR("failed to open censor list file %s", path);
+		return;
+	}
+
+	char line[256];
+	int count = 0, cap = 256;
+	censor_list = malloc(cap * sizeof(int));
+	int line_no = 0;
+	while (fgets(line, sizeof(line), fp)) {
+		line_no++;
+		char *p = line;
+		char *comment = strchr(p, '#');
+		if (comment)
+			*comment = '\0';
+		while (*p && isspace((unsigned char)*p))
+			p++;
+		if (*p == '\0')
+			continue;
+
+		if (count >= cap) {
+			cap *= 2;
+			censor_list = realloc(censor_list, cap * sizeof(int));
+		}
+		char *endptr;
+		censor_list[count++] = (int)strtol(p, &endptr, 10);
+
+		while (*endptr && isspace((unsigned char)*endptr))
+			endptr++;
+		if (*endptr != '\0')
+			WARNING("invalid line %d in %s", line_no, path);
+	}
+	censor_list_size = count;
+
+	fclose(fp);
+
+	if (censor_list_size > 0) {
+		qsort(censor_list, censor_list_size, sizeof(int), compare_integers);
+	} else {
+		free(censor_list);
+		censor_list = NULL;
+	}
+}
diff --git a/src/cg.h b/src/cg.h
index 221574d..da54abd 100644
--- a/src/cg.h
+++ b/src/cg.h
@@ -84,6 +84,7 @@ extern void cg_get_info(int no, SDL_Rect *info);
 extern void cg_clear_display_loc();
 extern void cgdata_free(cgdata *cg);
 extern struct SDL_Surface *cg_load_as_sdlsurface(int no);
+extern void load_censor_list(const char *path);
 
 extern int cg_vspPB;
 extern int cg_fflg;
diff --git a/src/xsystem35.c b/src/xsystem35.c
index bc2911b..d6a6cb9 100644
--- a/src/xsystem35.c
+++ b/src/xsystem35.c
@@ -56,6 +56,7 @@
 #include "randMT.h"
 #include "ags.h"
 #include "font.h"
+#include "cg.h"
 #include "gfx.h"
 #include "event.h"
 #include "menu.h"
@@ -114,6 +115,7 @@ static void sys35_usage(bool verbose) {
 	puts(" -playlist file          : load CD playlist from 'file'");
 	puts(" -texthook mode          : text hook mode. 'none' (default), 'print' or 'copy'");
 	puts(" -texthook_suppress list : suppress text hook on specified pages");
+	puts(" -censor file            : mosaic images listed in 'file'");
 	
 	puts(" -M?                     : select output midi methos");
 #ifdef ENABLE_MIDI_SDLMIXER
@@ -254,6 +256,10 @@ static void sys35_ParseOption(int *argc, char **argv) {
 			if (argv[i + 1] != NULL) {
 				texthook_set_suppression_list(argv[i + 1]);
 			}
+		} else if (0 == strcmp(argv[i], "-censor")) {
+			if (argv[i + 1] != NULL) {
+				load_censor_list(argv[i + 1]);
+			}
 		} else if (0 == strncmp(argv[i], "-M", 2)) {
 			int subdev = 0;
 			if (argv[i][3] != '\0') {
@@ -399,6 +405,12 @@ static void check_profile() {
 	if (param) {
 		texthook_set_suppression_list(param);
 	}
+
+	/* Censor list for streamer mode */
+	param = get_profile("censor");
+	if (param) {
+		load_censor_list(param);
+	}
 }
 
 #ifdef HAVE_SIGACTION
diff --git a/xsys35rc.sample b/xsys35rc.sample
index 13a6c7a..9ce8e0e 100644
--- a/xsys35rc.sample
+++ b/xsys35rc.sample
@@ -105,6 +105,13 @@
 
 #texthook_suppress: 7,11,15,16,17,18,23,24,32,33,197
 
+# Censor list for Streamer Mode.
+# This mosaics images listed in the specified file, making them safe for
+# streaming or public viewing. The file should contain one image number
+# per line, with '#' treated as comments.
+
+#censor: censor_list.txt
+
 # Enables the ZB command (change the font weight). It is disabled by default
 # because it makes the text too bold with our default fonts.
 # This option is experimental and may be removed in the future. See