diff --git a/internal_filesystem/apps/com.micropythonos.doom/META-INF/MANIFEST.JSON b/internal_filesystem/apps/com.micropythonos.doom/META-INF/MANIFEST.JSON
new file mode 100644
index 00000000..dad1371a
--- /dev/null
+++ b/internal_filesystem/apps/com.micropythonos.doom/META-INF/MANIFEST.JSON
@@ -0,0 +1,24 @@
+{
+"name": "Doom",
+"publisher": "MicroPythonOS",
+"short_description": "Legendary 3D shooter",
+"long_description": "Plays Doom 1, 2 and modded .wad files from internal storage or SD card and plays them. Place them in the folder /roms/doom/ . Uses ducalex's retro-go port of PrBoom. Supports zipped wad files too.",
+"icon_url": "https://apps.micropythonos.com/apps/com.micropythonos.doom/icons/com.micropythonos.doom_0.0.1_64x64.png",
+"download_url": "https://apps.micropythonos.com/apps/com.micropythonos.doom/mpks/com.micropythonos.doom_0.0.1.mpk",
+"fullname": "com.micropythonos.doom",
+"version": "0.0.1",
+"category": "games",
+"activities": [
+    {
+      "entrypoint": "assets/doom.py",
+      "classname": "Doom",
+      "intent_filters": [
+        {
+          "action": "main",
+          "category": "launcher"
+        }
+      ]
+    }
+  ]
+}
+
diff --git a/internal_filesystem/apps/com.micropythonos.doom/assets/doom.py b/internal_filesystem/apps/com.micropythonos.doom/assets/doom.py
new file mode 100644
index 00000000..28591b6d
--- /dev/null
+++ b/internal_filesystem/apps/com.micropythonos.doom/assets/doom.py
@@ -0,0 +1,88 @@
+from mpos.apps import Activity
+
+class Doom(Activity):
+
+    romdir = "/roms"
+    doomdir = romdir + "/doom"
+    retrogodir = "/retro-go"
+    configdir = retrogodir + "/config"
+    bootfile = configdir + "/boot.json"
+    #partition_label = "prboom-go"
+    partition_label = "retro-core"
+    # Widgets:
+    status_label = None
+
+    def onCreate(self):
+        screen = lv.obj()
+        self.status_label = lv.label(screen)
+        self.status_label.set_width(lv.pct(90))
+        self.status_label.set_text(f'Looking for .wad or .zip files in {self.doomdir} on internal storage and SD card...')
+        self.status_label.set_long_mode(lv.label.LONG_MODE.WRAP)
+        self.status_label.center()
+        self.setContentView(screen)
+
+    def onResume(self, screen):
+        self.start_wad(self.doomdir + '/Doom v1.9 Free Shareware.zip')
+
+    def mkdir(self, dirname):
+        # Would be better to only create it if it doesn't exist
+        try:
+            import os
+            os.mkdir(dirname)
+        except Exception as e:
+            self.status_label.set_text(f"Info: could not create directory {dirname} because: {e}")
+
+    def start_wad(self, wadfile):
+        self.mkdir(self.romdir)
+        self.mkdir(self.doomdir)
+        self.mkdir(self.retrogodir)
+        self.mkdir(self.configdir)
+        try:
+            import os
+            import json
+            # Would be better to only write this if it differs from what's already there:
+            fd = open(self.bootfile, 'w')
+            '''
+            bootconfig = {
+                "BootName": "doom",
+                "BootArgs": f"/sd{wadfile}",
+                "BootSlot": -1,
+                "BootFlags": 0
+            }
+            '''
+            bootconfig = {
+                "BootName": "nes",
+                "BootArgs": "/sd/roms/nes/homebrew/Yun.zip",
+                "BootSlot": -1,
+                "BootFlags": 0
+            }
+            json.dump(bootconfig, fd)
+            fd.close()
+        except Exception as e:
+            self.status_label.set_text(f"ERROR: could not write config file: {e}")
+            return
+        results = []
+        try:
+            from esp32 import Partition
+            results = Partition.find(label=self.partition_label)
+        except Exception as e:
+            self.status_label.set_text(f"ERROR: could not search for internal partition with label {self.partition_label}, unable to start: {e}")
+            return
+        if len(results) < 1:
+            self.status_label.set_text(f"ERROR: could not find internal partition with label {self.partition_label}, unable to start")
+            return
+        partition = results[0]
+        try:
+            partition.set_boot()
+        except Exception as e:
+            print(f"ERROR: could not set partition {partition} as boot, it probably doesn't contain a valid program: {e}")
+        try:
+            import vfs
+            vfs.umount('/')
+        except Exception as e:
+            print(f"Warning: could not unmount internal filesystem from /: {e}")
+        try:
+            import machine
+            machine.reset()
+        except Exception as e:
+            print(f"Warning: could not restart machine: {e}")
diff --git a/internal_filesystem/apps/com.micropythonos.doom/res/mipmap-mdpi/icon_64x64.png b/internal_filesystem/apps/com.micropythonos.doom/res/mipmap-mdpi/icon_64x64.png
new file mode 100644
index 00000000..2c64582b
Binary files /dev/null and b/internal_filesystem/apps/com.micropythonos.doom/res/mipmap-mdpi/icon_64x64.png differ
diff --git a/scripts/flash_over_usb.sh b/scripts/flash_over_usb.sh
index 8033bbf0..c56030f5 100755
--- a/scripts/flash_over_usb.sh
+++ b/scripts/flash_over_usb.sh
@@ -9,5 +9,5 @@ ls -al $fwfile
 echo "Add --erase-all if needed"
 sleep 5
 # This needs python and the esptool
-~/.espressif/python_env/*/bin/python -m esptool --chip esp32s3 --before default_reset --after hard_reset write_flash --flash_mode dio --flash_size 16MB --flash_freq 80m 0 $fwfile $1
+~/.espressif/python_env/*/bin/python -m esptool --chip esp32s3 --before default_reset --after hard_reset write_flash --flash_mode dio --flash_size 16MB --flash_freq 80m 0 $fwfile $@
 
diff --git a/scripts/mklittlefs.sh b/scripts/mklittlefs.sh
index 1f7be0c4..a9d0aa78 100755
--- a/scripts/mklittlefs.sh
+++ b/scripts/mklittlefs.sh
@@ -3,6 +3,9 @@
 mydir=$(readlink -f "$0")
 mydir=$(dirname "$mydir")
 
-size=0x200000 # 2MB
-~/sources/mklittlefs/mklittlefs -c "$mydir"/../internal_filesystem/ -s "$size" internal_filesystem.bin
+#size=0x200000 # 2MB
+#~/sources/mklittlefs/mklittlefs -c "$mydir"/../internal_filesystem/ -s "$size" internal_filesystem.bin
+
+size=0x520000
+~/sources/mklittlefs/mklittlefs -c "$mydir"/../../../internalsd_zips_removed_gb_romart -s "$size" internalsd_zips_removed_gb_romart.bin