diff --git a/28_day/Makefile b/28_day/Makefile
index 2d22dbf..732a74d 100644
--- a/28_day/Makefile
+++ b/28_day/Makefile
@@ -20,7 +20,7 @@ haribote.img : haribote/ipl10.bin haribote/haribote.sys Makefile \
 		star1/star1.hrb stars/stars.hrb stars2/stars2.hrb \
 		lines/lines.hrb walk/walk.hrb noodle/noodle.hrb \
 		beepdown/beepdown.hrb color/color.hrb color2/color2.hrb \
-		sosu/sosu.hrb sosu3/sosu3.hrb
+		sosu/sosu.hrb sosu2/sosu2.hrb sosu3/sosu3.hrb
 	$(EDIMG)   imgin:../z_tools/fdimg0at.tek \
 		wbinimg src:haribote/ipl10.bin len:512 from:0 to:0 \
 		copy from:haribote/haribote.sys to:@: \
@@ -43,6 +43,7 @@ haribote.img : haribote/ipl10.bin haribote/haribote.sys Makefile \
 		copy from:color/color.hrb to:@: \
 		copy from:color2/color2.hrb to:@: \
 		copy from:sosu/sosu.hrb to:@: \
+		copy from:sosu2/sosu2.hrb to:@: \
 		copy from:sosu3/sosu3.hrb to:@: \
 		imgout:haribote.img
 
@@ -77,6 +78,7 @@ full :
 	$(MAKE) -C color
 	$(MAKE) -C color2
 	$(MAKE) -C sosu
+	$(MAKE) -C sosu2
 	$(MAKE) -C sosu3
 	$(MAKE) haribote.img
 
@@ -120,6 +122,7 @@ clean_full :
 	$(MAKE) -C color		clean
 	$(MAKE) -C color2		clean
 	$(MAKE) -C sosu			clean
+	$(MAKE) -C sosu2		clean
 	$(MAKE) -C sosu3		clean
 
 src_only_full :
@@ -142,6 +145,7 @@ src_only_full :
 	$(MAKE) -C color		src_only
 	$(MAKE) -C color2		src_only
 	$(MAKE) -C sosu			src_only
+	$(MAKE) -C sosu2		src_only
 	$(MAKE) -C sosu3		src_only
 	-$(DEL) haribote.img
 
diff --git a/28_day/apilib/Makefile b/28_day/apilib/Makefile
index 35ff0ac..05c00ea 100644
--- a/28_day/apilib/Makefile
+++ b/28_day/apilib/Makefile
@@ -1,7 +1,8 @@
 OBJS_API =	api001.obj api002.obj api003.obj api004.obj api005.obj api006.obj \
 			api007.obj api008.obj api009.obj api010.obj api011.obj api012.obj \
 			api013.obj api014.obj api015.obj api016.obj api017.obj api018.obj \
-			api019.obj api020.obj
+			api019.obj api020.obj \
+			alloca.obj
 
 TOOLPATH = ../../z_tools/
 INCPATH  = ../../z_tools/haribote/
diff --git a/28_day/apilib/alloca.nas b/28_day/apilib/alloca.nas
new file mode 100644
index 0000000..b94f8e2
--- /dev/null
+++ b/28_day/apilib/alloca.nas
@@ -0,0 +1,13 @@
+[FORMAT "WCOFF"]
+[INSTRSET "i486p"]
+[BITS 32]
+[FILE "alloca.nas"]
+
+		GLOBAL	__alloca
+
+[SECTION .text]
+
+__alloca:
+		ADD		EAX,-4
+		SUB		ESP,EAX
+		JMP		DWORD [ESP+EAX]		; 代替RET
diff --git a/28_day/winhelo/Makefile b/28_day/winhelo/Makefile
index fe2c669..44ac359 100644
--- a/28_day/winhelo/Makefile
+++ b/28_day/winhelo/Makefile
@@ -1,5 +1,5 @@
 APP      = winhelo
-STACK    = 1k
+STACK    = 8k
 MALLOC   = 0k
 
 include ../app_make.txt
diff --git a/28_day/winhelo/winhelo.c b/28_day/winhelo/winhelo.c
index 8059d36..c36e988 100644
--- a/28_day/winhelo/winhelo.c
+++ b/28_day/winhelo/winhelo.c
@@ -1,10 +1,10 @@
 #include "apilib.h"
 
-char buf[150 * 50];
-
 void HariMain(void)
 {
 	int win;
+	char buf[150 * 50];
+
 	win = api_openwin(buf, 150, 50, -1, "hello");
 	for (;;) {
 		if (api_getkey(1) == 0x0a) {
diff --git a/28_day/winhelo2/Makefile b/28_day/winhelo2/Makefile
index df62c78..a1544f5 100644
--- a/28_day/winhelo2/Makefile
+++ b/28_day/winhelo2/Makefile
@@ -1,5 +1,5 @@
 APP      = winhelo2
-STACK    = 1k
+STACK    = 8k
 MALLOC   = 0k
 
 include ../app_make.txt
diff --git a/28_day/winhelo2/winhelo2.c b/28_day/winhelo2/winhelo2.c
index 2937402..dfc4ce7 100644
--- a/28_day/winhelo2/winhelo2.c
+++ b/28_day/winhelo2/winhelo2.c
@@ -1,10 +1,10 @@
 #include "apilib.h"
 
-char buf[150 * 50];
-
 void HariMain(void)
 {
 	int win;
+	char buf[150 * 50];
+	
 	win = api_openwin(buf, 150, 50, -1, "hello");
 	api_boxfilwin(win,  8, 36, 141, 43, 3); /*黄色*/
 	api_putstrwin(win, 28, 28, 0 /*黑色*/, 12, "hello, world");