diff --git a/source/retrofw/.gitignore b/source/retrofw/.gitignore
new file mode 100644
index 0000000..1a96633
--- /dev/null
+++ b/source/retrofw/.gitignore
@@ -0,0 +1 @@
+methane.opk
diff --git a/source/retrofw/makefile b/source/retrofw/makefile
index 7b81357..1b25188 100644
--- a/source/retrofw/makefile
+++ b/source/retrofw/makefile
@@ -30,6 +30,11 @@ methane: MainSource/gfxoff.o MainSource/baddie.o MainSource/bitdraw.o MainSource
 	-o methane ${METHANE_LIBS} ${METHANE_SND_LIBS} ${LDFLAGS}
 	$(STRIP) methane
 
+opk: methane
+	rm -rf opkg/methane
+	cp methane opkg/
+	mksquashfs opkg methane.opk -noappend -no-xattrs
+
 clean:
 	@rm -f MainSource/*.o
 	@rm -f MainData/*.o
diff --git a/source/retrofw/opkg/icon.png b/source/retrofw/opkg/icon.png
new file mode 100644
index 0000000..1ef3576
Binary files /dev/null and b/source/retrofw/opkg/icon.png differ
diff --git a/source/retrofw/opkg/readme.txt b/source/retrofw/opkg/readme.txt
new file mode 100644
index 0000000..33d7ac6
--- /dev/null
+++ b/source/retrofw/opkg/readme.txt
@@ -0,0 +1,46 @@
+This is a stable version of the Linux conversion of the
+Super Methane Brothers game.
+
+WebSite:
+http://methane.sourceforge.net/index.html
+
+Email:
+rombust at postmaster.co.uk
+
+-------------------------------------------------------
+IMPORTANT NOTE:
+This is a conversion of the Commodore Amiga game.
+I had been given permission by the company (Apache Software Ltd)
+to release this game as GPL.
+However - THE ORIGINAL AMIGA VERSION OF SUPER METHANE BROTHERS IS
+STILL A COMMERCIAL GAME IT'S LICENCE HAS NOT CHANGED.
+
+I (Mark Page) am the programmer of the Amiga version of
+Super Methane Brothers.
+-------------------------------------------------------
+
+more "install" for how to compile the game (any platform)
+more "todo" for bugs in the game
+more "copying" for GPL licence
+
+-------------------------------------------------------
+
+Quick Instructions
+===================
+
+Press the CTRL key to start the game.
+Use the cursor keys to move around the screen.
+Tap the CTRL key to fire gas from the gun.
+Hold the CTRL key to suck a trapped baddie into the gun.
+Release the CTRL key to throw the trapped baddie from the gun.
+Throw baddies at the wall to destroy them.
+
+(Linux Only) Press Escape to quit the game
+
+See "docs/info.html" for further instructions on how to play the game.
+
+-------------------------------------------------------
+
+The port is based on Spot's SDL1 source codes (see OS4Depot.net).
+
+Ported for RetroFW by vamastah (a.k.a. szymor).
diff --git a/source/retrofw/opkg/smb.retrofw.desktop b/source/retrofw/opkg/smb.retrofw.desktop
new file mode 100644
index 0000000..7090340
--- /dev/null
+++ b/source/retrofw/opkg/smb.retrofw.desktop
@@ -0,0 +1,11 @@
+[Desktop Entry]
+Name=SMB
+Comment=Super Methane Brothers
+Exec=methane
+Terminal=false
+Type=Game
+StartupNotify=true
+Icon=icon
+Categories=games;
+Version=20200825
+X-OD-Manual=readme.txt