From 0294966cd508270d3365ca5ca5fa1e0ada67d359 Mon Sep 17 00:00:00 2001
From: officialcjunior <realc@protonmail.com>
Date: Sat, 15 Aug 2020 21:21:55 +0530
Subject: [PATCH] Add Misc challenge: Invisible Maze

---
 2020/Misc/Invisible-Maze/Admin/README.md    |   5 +
 2020/Misc/Invisible-Maze/Admin/image_data.c |  64 +++++++
 2020/Misc/Invisible-Maze/Admin/image_map.c  |  21 +++
 2020/Misc/Invisible-Maze/Admin/output.c     | 185 ++++++++++++++++++++
 2020/Misc/Invisible-Maze/Handout/output.gb  | Bin 0 -> 32768 bytes
 2020/Misc/Invisible-Maze/README.md          |  14 ++
 2020/Misc/README.md                         |   1 +
 7 files changed, 290 insertions(+)
 create mode 100644 2020/Misc/Invisible-Maze/Admin/README.md
 create mode 100644 2020/Misc/Invisible-Maze/Admin/image_data.c
 create mode 100644 2020/Misc/Invisible-Maze/Admin/image_map.c
 create mode 100644 2020/Misc/Invisible-Maze/Admin/output.c
 create mode 100644 2020/Misc/Invisible-Maze/Handout/output.gb
 create mode 100644 2020/Misc/Invisible-Maze/README.md

diff --git a/2020/Misc/Invisible-Maze/Admin/README.md b/2020/Misc/Invisible-Maze/Admin/README.md
new file mode 100644
index 0000000..c3b2c73
--- /dev/null
+++ b/2020/Misc/Invisible-Maze/Admin/README.md
@@ -0,0 +1,5 @@
+## Build Instructions
+
+Install Game Boy Development Kit (GBDK) and use the following command:
+
+`lcc -Wa-l -Wl-m -o output.gb test.c`
\ No newline at end of file
diff --git a/2020/Misc/Invisible-Maze/Admin/image_data.c b/2020/Misc/Invisible-Maze/Admin/image_data.c
new file mode 100644
index 0000000..f43dcec
--- /dev/null
+++ b/2020/Misc/Invisible-Maze/Admin/image_data.c
@@ -0,0 +1,64 @@
+/* 
+ Tiles data
+
+ Number of Tiles   : 54
+*/ 
+
+const unsigned char image_data[] = {
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x02,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x32,0x01,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x60,0x04,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0x01,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x15,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x18,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x55,0x00,0x92,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x01,0x00,0x01,0x00,0x52,0x00,0x42,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x81,0x42,0x64,0x01,0xE5,0x00,0x34,0x00,0x10,0x00,0x00,0x00,0x02,0x00,0x0F,0x00,
+	0x21,0x10,0x3A,0x01,0xC9,0x00,0x4D,0x80,0x8B,0x00,0x00,0x00,0xAA,0x00,0xFF,0x00,
+	0x0C,0x20,0x64,0x00,0xCC,0x00,0x64,0x00,0x2C,0x00,0x00,0x00,0xAA,0x00,0xFF,0x00,
+	0x43,0x00,0x62,0x00,0x47,0x00,0x64,0x00,0x40,0x00,0x00,0x00,0xAA,0x00,0xFF,0x00,
+	0x80,0x00,0x00,0x80,0xC0,0x00,0x45,0x00,0x44,0x00,0x00,0x00,0xA2,0x00,0xCF,0x20,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x55,0x00,0x92,0x00,0x00,0x00,0xAA,0x00,0xFF,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x50,0x00,0x48,0x00,0x00,0x00,0xA8,0x00,0xF8,0x00,
+	0x1E,0x00,0x1D,0x02,0x1F,0x00,0x1F,0x00,0x1F,0x00,0x1F,0x00,0x1D,0x02,0x1F,0x00,
+	0x00,0x00,0x80,0x00,0x80,0x00,0x00,0x80,0x80,0x00,0xC0,0x00,0x8F,0x00,0x9F,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0xFF,0x00,
+	0x1F,0x00,0x1F,0x00,0x1D,0x02,0x1F,0x00,0x1F,0x00,0x1F,0x00,0x1D,0x02,0xDF,0x00,
+	0xFF,0x00,0xFF,0x00,0xBF,0x40,0xC0,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0xC0,0x00,
+	0xFF,0x00,0xFE,0x01,0xFF,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x01,0x00,
+	0xEF,0x10,0xFD,0x02,0xFF,0x00,0xDC,0x20,0xFC,0x00,0xFC,0x00,0xF8,0x00,0xFC,0x00,
+	0xEF,0x00,0xFF,0x00,0xEB,0x04,0x0F,0x00,0x1F,0x00,0x07,0x08,0x0D,0x02,0x1F,0x00,
+	0xFF,0x00,0xFF,0x00,0x7B,0x84,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xFF,0x00,
+	0xF8,0x00,0xF8,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,
+	0x1F,0x00,0x1F,0x00,0x1F,0x00,0x1B,0x04,0x1F,0x00,0x1E,0x01,0x1F,0x00,0x1F,0x00,
+	0x3F,0x80,0x9F,0x00,0xDF,0x00,0xBF,0x00,0xBF,0x00,0xB7,0x08,0x9F,0x00,0x3F,0x80,
+	0xFF,0x00,0xFF,0x00,0x8F,0x00,0x8B,0x04,0x0F,0x00,0x8F,0x00,0x8E,0x01,0x0F,0x00,
+	0xDE,0x01,0xDF,0x00,0xDF,0x00,0x5F,0x80,0xDF,0x00,0xD7,0x08,0xDF,0x00,0xDF,0x00,
+	0x80,0x00,0x80,0x00,0x00,0x80,0x00,0x80,0x80,0x00,0x7F,0x80,0xFF,0x00,0xFF,0x00,
+	0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xF1,0x00,0xF0,0x00,0xF9,0x00,
+	0xD8,0x20,0xFC,0x00,0xFC,0x00,0xB8,0x40,0xFC,0x00,0xFC,0x00,0x78,0x80,0xFC,0x00,
+	0x0F,0x00,0x1F,0x00,0x0E,0x01,0x1F,0x00,0x0F,0x00,0x0B,0x04,0x03,0x00,0x01,0x00,
+	0xFF,0x00,0xFF,0x00,0xEF,0x10,0xC4,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,0xC0,0x00,
+	0x00,0x80,0x00,0x80,0x80,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x1F,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0xBB,0x04,0x9B,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x8F,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x4B,0x84,0xC3,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0xFF,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0xFC,0x00,0xF4,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0xB8,0x40,0xBC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0xC0,0x00,
+	0x0E,0x01,0x0E,0x04,0x08,0x04,0x0C,0x00,0x0C,0x00,0x08,0x04,0x0E,0x04,0x0E,0x01,
+	0x03,0xC0,0x43,0x21,0x12,0x21,0x33,0x00,0x33,0x00,0x13,0x20,0x43,0x20,0xC3,0x80,
+	0xA0,0x63,0x8E,0x04,0x04,0x08,0x08,0x08,0x0F,0x0F,0x00,0x08,0x08,0x04,0x07,0x01,
+	0x42,0x81,0x62,0x04,0x24,0x24,0x15,0x22,0xE1,0xE0,0x00,0x00,0x24,0x00,0x60,0x83,
+	0x40,0x81,0x27,0x02,0x02,0x04,0x84,0x04,0xA7,0x47,0x20,0x24,0x44,0x22,0x43,0x80,
+	0x23,0xC0,0x33,0x01,0x13,0x10,0x13,0x10,0xFB,0xF0,0x03,0x00,0x13,0x00,0xA3,0xC0,
+	0x81,0x70,0x90,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,
+	0xF9,0xF0,0xC1,0x02,0xC2,0x02,0xC2,0x01,0xC0,0x00,0xC0,0x00,0x82,0x40,0x58,0x31,
+	0x20,0xC0,0x10,0x00,0x00,0x00,0xC0,0x00,0xD0,0x20,0x10,0x10,0x20,0x10,0x20,0xC0,
+	0x0C,0x00,0x0C,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
+	
+};
+
diff --git a/2020/Misc/Invisible-Maze/Admin/image_map.c b/2020/Misc/Invisible-Maze/Admin/image_map.c
new file mode 100644
index 0000000..e7bd22a
--- /dev/null
+++ b/2020/Misc/Invisible-Maze/Admin/image_map.c
@@ -0,0 +1,21 @@
+/*
+ Tiles map
+
+ TileMap Size      : 20 x 18
+*/
+
+const unsigned char image_map[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
+	0x03, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x23, 0x24, 0x25,
+	0x26, 0x27, 0x28, 0x29, 0x00, 0x2A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x35,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
\ No newline at end of file
diff --git a/2020/Misc/Invisible-Maze/Admin/output.c b/2020/Misc/Invisible-Maze/Admin/output.c
new file mode 100644
index 0000000..c493dad
--- /dev/null
+++ b/2020/Misc/Invisible-Maze/Admin/output.c
@@ -0,0 +1,185 @@
+#include <gb/gb.h>
+#include <gb/drawing.h>
+#include <gb/font.h>
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+#include "image_data.c"
+#include "image_map.c"
+#define key "KRUHZ=\x03\t\x07!R\x04!0\x05\n\x05RX!\x04:!>\x05PX\x08?"
+
+char fakeflag[49] = "flag{https://www.youtube.com/watch?v=dQw4w9WgXcQ}";
+
+char k[30];
+
+unsigned char backgroundcharacters[] = { 0xFF, 0x00, 0x80, 0x7F, 0x80, 0x7F, 0x80, 0x7F, 0x80, 0x7F, 0x80, 0x7F, 0x80, 0x7F, 0x80, 0x7F,
+	0xFF, 0x00, 0x01, 0xFE, 0x03, 0xFC, 0x07, 0xF8, 0x0F, 0xF0, 0x1F, 0xE0, 0x3F, 0xC0, 0x7F, 0x80,
+	0xFF, 0x00, 0xFE, 0x01, 0xFC, 0x03, 0xF8, 0x07, 0xF0, 0x0F, 0xE0, 0x1F, 0xC0, 0x3F, 0x80, 0x7F,
+	0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
+	0xFF, 0x00, 0xFF, 0x01, 0xFD, 0x03, 0xF9, 0x07, 0xF1, 0x0F, 0xE1, 0x1F, 0xC1, 0x3F, 0x81, 0x7F,
+	0x80, 0x7F, 0x81, 0x7E, 0x83, 0x7C, 0x87, 0x78, 0x8F, 0x70, 0x9F, 0x60, 0xBF, 0x40, 0xFF, 0x00,
+	0xFF, 0x70, 0xFF, 0x98, 0xEF, 0xB8, 0xCF, 0xF8, 0xFF, 0x70, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x01,
+	0xFF, 0x00, 0xFE, 0x01, 0xFC, 0x03, 0xF8, 0x07, 0xF0, 0x0F, 0xE0, 0x1F, 0xC0, 0x3F, 0xFF, 0xFF
+};
+
+unsigned char spritetiles[] = { 255, 0, 255, 0, 255, 0, 255, 0 };
+
+unsigned char bgmap[] = { 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2,
+	1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3
+};
+
+void printflag(UBYTE k1, UBYTE k2, int i)
+{
+	for (i = 0; i < 29; i++)
+	{
+		k[i] = (((key[i] + k1) ^ k2));
+	}
+	k[i] = 0;
+	printf("Way to go! \n flg if u not noob: %s\n", k);
+
+}
+
+//beep sound on each movement
+void beep(UBYTE counter)
+{
+	NR50_REG = 0xFF;
+	NR51_REG = 0xFF;
+	NR52_REG = 0x80;
+	if (counter)
+	{
+		NR10_REG = 0x38 U;
+		NR11_REG = 0x70 U;
+		NR12_REG = 0xE0 U;
+		NR13_REG = 0x0A U;
+		NR14_REG = 0xC6 U;
+		NR51_REG |= 0x11;
+		delay(20);
+	}
+}
+
+void milestone_beep(UBYTE counter)
+{
+	NR50_REG = 0xFF;
+	NR51_REG = 0xFF;
+	NR52_REG = 0x80;
+	if (counter)
+	{
+		NR10_REG = 0x15;
+		NR11_REG = 0x96;
+		NR12_REG = 0x73;
+		NR13_REG = 0xBB;
+		NR14_REG = 0x85;
+		delay(20);
+	}
+}
+
+void main()
+{
+	UBYTE counter, x, y, i, k1, k2;
+	x = 6;
+	y = 8;
+	k1 = 0;
+	k2 = 0;
+	font_init();
+
+	set_bkg_data(0, 112, image_data);
+	set_bkg_tiles(0, 0, 20, 18, image_map);
+	SHOW_BKG;
+	DISPLAY_ON;
+	waitpad(J_START);
+
+	gotogxy(7, 88);
+	printf("Weclome! \n\n\n to the invisible maze \n Press Start to \n play. \n\n Place the flag \n on the right \n position to get the\n flag!");
+	waitpad(J_START);
+
+	disable_interrupts();
+	DISPLAY_OFF;
+
+	set_bkg_data(0, 4, backgroundcharacters);
+	for (counter = 0; counter <= 16; counter += 2)
+		set_bkg_tiles(0, counter, 20, 2, bgmap);
+
+	SPRITES_8x8;
+	set_sprite_data(0, 1, spritetiles);
+	set_sprite_tile(0, 0);
+	move_sprite(0, x, y);
+
+	SHOW_BKG;
+	SHOW_SPRITES;
+	DISPLAY_ON;
+	enable_interrupts();
+
+	while (1)
+	{
+		for (counter = 0; counter < 9; counter++)
+		{
+			wait_vbl_done();
+		}
+		counter = joypad();
+
+		if (counter & J_UP)
+		{
+			y--;
+			beep(counter);
+		}
+		if (counter & J_DOWN)
+		{
+			y++;
+			beep(counter);
+		}
+		if (counter & J_LEFT)
+		{
+			x--;
+			beep(counter);
+		}
+		if (counter & J_RIGHT)
+		{
+			x++;
+			beep(counter);
+		}
+
+		if (x == 6 && y == 8)
+		{
+			k1 = k1 + x;
+			k2 = k2 + y;
+			milestone_beep(counter);
+		}
+
+		if (x == 5 && y == 3)
+		{
+			k1 = k1 / x;
+			k2 = k2 / y;
+			milestone_beep(counter);
+		}
+
+		if (x == 12 && y == 5)
+		{
+			k1 = k1 + x;
+			k2 = k2 + y;
+			milestone_beep(counter);
+		}
+
+		if (x == 4 && y == 5)
+		{
+			k1 = k1 * x;
+			k2 = k2 * y;
+			milestone_beep(counter);
+		}
+
+		if (x == 15 && y == 10)
+		{
+			k1 = k1 - x;
+			k2 = k2 - y;
+			milestone_beep(counter);
+		}
+
+		if (k1 == 37 && k2 == 25)
+		{
+			printflag(k1, k2, i);
+			set_sprite_tile(0, 0);
+			break;
+		}
+
+		move_sprite(0, x, y);
+	}
+}
diff --git a/2020/Misc/Invisible-Maze/Handout/output.gb b/2020/Misc/Invisible-Maze/Handout/output.gb
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diff --git a/2020/Misc/Invisible-Maze/README.md b/2020/Misc/Invisible-Maze/README.md
new file mode 100644
index 0000000..c2c994d
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@@ -0,0 +1,14 @@
+# Invisible Maze
+
+**Description**
+
+Move the flag in just the right ways or just hack the game!
+
+**Author**: [officialcjunior](https://twitter.com/cjuniorstweeets) & [k4iz3n](https://twitter.com/akulpillai)  
+
+**Short writeup**
++ Challenge is a Nintendo GameBoy ROM image.
++ Reverse the ROM and figure out the implementation
++ Analyze the calling function's checks to find the path along which we must move.
+
+**FLAG**: `inctf{175_n0_L363nd_0F_z3ld4}`
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diff --git a/2020/Misc/README.md b/2020/Misc/README.md
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+++ b/2020/Misc/README.md
@@ -3,4 +3,5 @@
 |S.No.| Challenge Name | Status  |
 |:---:|:--------------:|:-------:|
 |1| [Secure Note](Secure-Note/)|Done|
+|2| [Invisible Maze](Invisible-Maze/)|Done|