diff --git a/src/Formats.c b/src/Formats.c
index 036a4f4d6..a789b15db 100644
--- a/src/Formats.c
+++ b/src/Formats.c
@@ -1149,7 +1149,9 @@ ReturnCode Cw_Save(struct Stream* stream) {
 	if ((res = Stream_Write(stream, tmp, sizeof(cw_meta_cpe) + len))) return res;
 
 	if ((res = Stream_Write(stream, cw_meta_defs, sizeof(cw_meta_defs)))) return res;
-	for (b = 1; b < BLOCK_COUNT; b++) {
+	/* Write block definitions in reverse order so that software that only reads byte 'ID' */
+	/* still loads correct first 256 block defs when saving a map with over 256 block defs */
+	for (b = BLOCK_MAX_DEFINED; b >= 1; b--) {
 		if (!Block_IsCustomDefined(b)) continue;
 		if ((res = Cw_WriteBockDef(stream, b))) return res;
 	}
diff --git a/src/Platform.c b/src/Platform.c
index 1fa359f6d..8fcfcbf36 100644
--- a/src/Platform.c
+++ b/src/Platform.c
@@ -593,7 +593,13 @@ ReturnCode File_Write(FileHandle file, const uint8_t* buffer, uint32_t count, ui
 }
 
 ReturnCode File_Close(FileHandle file) {
+#ifndef CC_BUILD_WEB
 	return close(file) == -1 ? errno : 0;
+#else
+	int ret = close(file) == -1 ? errno : 0;
+	EM_ASM( FS.syncfs(false, function(err) { if (err) console.log(err); }); );
+	return ret;
+#endif
 }
 
 ReturnCode File_Seek(FileHandle file, int offset, int seekType) {
@@ -1373,9 +1379,24 @@ ReturnCode Socket_Connect(SocketHandle socket, const String* ip, int port) {
 }
 
 ReturnCode Socket_Read(SocketHandle socket, uint8_t* buffer, uint32_t count, uint32_t* modified) {
+#ifdef CC_BUILD_WEB
+	/* recv only reads one WebSocket frame at most, hence call it multiple times */
+	int recvCount = 0, pending;
+	*modified = 0;
+
+	while (count && !Socket_Available(socket, &pending) && pending) {
+		recvCount = recv(socket, buffer, count, 0);
+		if (recvCount == -1) return Socket__Error();
+
+		*modified += recvCount;
+		buffer    += recvCount; count -= recvCount;
+	}
+	return 0;
+#else
 	int recvCount = recv(socket, buffer, count, 0);
 	if (recvCount != -1) { *modified = recvCount; return 0; }
 	*modified = 0; return Socket__Error();
+#endif
 }
 
 ReturnCode Socket_Write(SocketHandle socket, uint8_t* buffer, uint32_t count, uint32_t* modified) {
@@ -1929,5 +1950,11 @@ void Platform_Init(void) {
 	TransformProcessType(&psn, kProcessTransformToForegroundApplication);
 }
 #elif defined CC_BUILD_WEB
-void Platform_Init(void) { }
+void Platform_Init(void) {
+	EM_ASM(
+		FS.mkdir('/classicube');
+		FS.mount(IDBFS, {}, '/classicube');
+		FS.syncfs(true, function(err) { if (err) console.log(err); });
+	);
+}
 #endif
diff --git a/src/Program.c b/src/Program.c
index 3f2c5cfa7..adcf075de 100644
--- a/src/Program.c
+++ b/src/Program.c
@@ -44,10 +44,12 @@ static void Program_RunGame(void) {
 	String title; char titleBuffer[STRING_SIZE];
 	int width, height;
 
+#ifndef CC_BUILD_WEB
 	if (!File_Exists(&defPath)) {
 		Window_ShowDialog("Missing file",
 			"default.zip is missing, try downloading resources first.\n\nThe game will still run, but without any textures");
 	}
+#endif
 
 	width  = Options_GetInt(OPT_WINDOW_WIDTH,  0, Display_Bounds.Width,  0);
 	height = Options_GetInt(OPT_WINDOW_HEIGHT, 0, Display_Bounds.Height, 0);
@@ -65,12 +67,16 @@ static void Program_RunGame(void) {
 
 /* Attempts to set current/working directory to the directory exe file is in */
 static void Program_SetCurrentDirectory(void) {
-#ifndef CC_BUILD_WEB
 	String path; char pathBuffer[FILENAME_SIZE];
 	int i;
 	ReturnCode res;
 	String_InitArray(path, pathBuffer);
 
+#ifdef CC_BUILD_WEB
+	String_AppendConst(&path, "/classicube");
+	res = Platform_SetCurrentDirectory(&path);
+	if (res) { Logger_Warn(res, "setting current directory"); return; }
+#else
 	res = Process_GetExePath(&path);
 	if (res) { Logger_Warn(res, "getting exe path"); return; }
 
@@ -134,9 +140,9 @@ int main(int argc, char** argv) {
 
 	argsCount = Platform_GetCommandLineArgs(argc, argv, args);
 	/* NOTE: Make sure to comment this out before pushing a commit */
-	/* String rawArgs = String_FromConst("UnknownShadow200 fffff 127.0.0.1 25565"); */
+	String rawArgs = String_FromConst("UnknownShadow200 fffff 127.0.0.1 25565");
 	/* String rawArgs = String_FromConst("UnknownShadow200"); */
-	/* argsCount = String_UNSAFE_Split(&rawArgs, ' ', args, 4); */
+	argsCount = String_UNSAFE_Split(&rawArgs, ' ', args, 4);
 
 	if (argsCount == 0) {
 #ifdef CC_BUILD_WEB
diff --git a/src/TexturePack.c b/src/TexturePack.c
index c74f67f64..c99f0a03c 100644
--- a/src/TexturePack.c
+++ b/src/TexturePack.c
@@ -640,6 +640,15 @@ void TexturePack_ExtractZip_File(const String* filename) {
 	struct Stream stream;
 	ReturnCode res;
 
+	/* TODO: This is an ugly hack to load textures from memory. */
+	/* We need to mount /classicube to IndexedDB, but texpacks folder */
+	/* should be read from memory. I don't know how to do that, */
+	/* since mounting /classicube/texpacks to memory doesn't work.. */
+#ifdef CC_BUILD_WEB
+	String memPath = String_FromConst("/");
+	Platform_SetCurrentDirectory(&memPath);
+#endif
+
 	String_InitArray(path, pathBuffer);
 	String_Format1(&path, "texpacks/%s", filename);
 
@@ -651,6 +660,11 @@ void TexturePack_ExtractZip_File(const String* filename) {
 
 	res = stream.Close(&stream);
 	if (res) { Logger_Warn2(res, "closing", &path); }
+
+#ifdef CC_BUILD_WEB
+	String idbPath = String_FromConst("/classicube");
+	Platform_SetCurrentDirectory(&idbPath);
+#endif
 }
 
 ReturnCode TexturePack_ExtractTerrainPng(struct Stream* stream) {
diff --git a/src/Window.c b/src/Window.c
index a14424ed7..f1bb9340e 100644
--- a/src/Window.c
+++ b/src/Window.c
@@ -2573,7 +2573,9 @@ static void Window_CorrectFocus(void) {
 }
 
 static EM_BOOL Window_MouseWheel(int type, const EmscriptenWheelEvent* ev, void* data) {
-	Mouse_SetWheel(Mouse_Wheel - ev->deltaY);
+	/* On my laptop, wheel movement of '1' is reported as '6.666666507' */
+	/* TODO: Verify this is the case on other platforms */
+	Mouse_SetWheel(Mouse_Wheel - ev->deltaY / 6.666666507f);
 	Window_CorrectFocus();
 	return true;
 }