diff --git a/duck/antideb.c b/duck/antideb.c
new file mode 100644
index 0000000..8a93a9f
--- /dev/null
+++ b/duck/antideb.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#define SIZE (1024*1024)
+
+int main() {
+	FILE *in = fopen("antideb", "r");
+	FILE *out = fopen("antideb_patched", "wb");
+	
+	char buffer[SIZE];
+	size_t bytes;
+
+	while (0 < (bytes = fread(buffer, 1, sizeof(buffer), in)))
+		    fwrite(buffer, 1, bytes, out);
+
+	long int offset = 0x5fa;
+	uint8_t new = 0x74;
+
+	fseek(out, offset, SEEK_SET);
+
+	fputc(new, out);
+	fclose(in);
+	fclose(out);
+	return 0;
+}
diff --git a/duck/crack.c b/duck/crack.c
new file mode 100644
index 0000000..ed4763a
--- /dev/null
+++ b/duck/crack.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#define SIZE (1024*1024)
+
+int main() {
+	FILE *in = fopen("source", "r");
+	FILE *out = fopen("cracked", "wb");
+	char buffer[SIZE];
+	size_t bytes;
+
+	while (0 < (bytes = fread(buffer, 1, sizeof(buffer), in)))
+		    fwrite(buffer, 1, bytes, out);
+	fclose(in);
+	fclose(out);
+
+	out = fopen("cracked", "r+b");
+	long int offset = 0x520;
+	uint8_t new = 0xe0;
+
+	fseek(out, offset, SEEK_SET);
+
+	fputc(new, out);
+	fclose(out);
+	return 0;
+}
diff --git a/duck/keygen.c b/duck/keygen.c
new file mode 100644
index 0000000..e9b18c2
--- /dev/null
+++ b/duck/keygen.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+int main() {
+	int card;
+	const int c = 0x1d60;
+	scanf("%d", &card);
+	printf("%d\n", c - card);
+	return 0;
+}
diff --git a/duck/tablet.c b/duck/tablet.c
new file mode 100644
index 0000000..d62e1a0
--- /dev/null
+++ b/duck/tablet.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#define SIZE (1024*1024)
+
+int main() {
+	FILE *in = fopen("source", "r");
+	FILE *out = fopen("cracked", "wb");
+	char buffer[SIZE];
+	size_t bytes;
+
+	while (0 < (bytes = fread(buffer, 1, sizeof(buffer), in)))
+		    fwrite(buffer, 1, bytes, out);
+
+
+	/* 0xe1feff54 */
+	unsigned int pattern = 0x54fffee1;
+	/* 0x1f2003d5 */
+	unsigned int new = 0xd503201f;
+	char buf[4];
+	fseek(out, 0x520, SEEK_SET);
+	while (0 < (bytes = fread(buf, 1, sizeof(buf), out)))
+		if (*(unsigned int *)buf == pattern)
+			break;
+	fwrite(&new, 4, 1, out);
+
+	fclose(in);
+	fclose(out);
+	return 0;
+}
diff --git a/duck/vendor.c b/duck/vendor.c
new file mode 100644
index 0000000..6718469
--- /dev/null
+++ b/duck/vendor.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main() {
+	unsigned int nya;
+	scanf("%u", &nya);
+	const unsigned int i_ebx = *(const unsigned int *)"Genu";
+	const unsigned int i_edx = *(const unsigned int *)"ineI";
+	const unsigned int i_ecx = *(const unsigned int *)"ntel";
+	
+	const unsigned int a_ebx = *(const unsigned int *)"Auth";
+	const unsigned int a_edx = *(const unsigned int *)"enti";
+	const unsigned int a_ecx = *(const unsigned int *)"cAMD";
+	
+	printf("%u", nya^i_ebx^i_edx^i_ecx ^ a_ebx^a_edx^a_ecx);
+
+}