diff --git a/src/lib.rs b/src/lib.rs
index 40a2c69..b1e0fd6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 pub mod error;
 pub(crate) mod io;
 pub mod v5;
+pub mod v6;
 
 use io::read_u8;
 use std::io::{Read, Write};
@@ -11,6 +12,7 @@ use crate::io::read_magic;
 #[derive(Debug)]
 pub enum BlotterFile {
     V5(v5::BlotterFile),
+    V6(v6::BlotterFile),
 }
 
 impl BlotterFile {
@@ -18,7 +20,8 @@ impl BlotterFile {
         read_magic(reader, b"Logic World save")?;
         let save_version = read_u8(reader)?;
         match save_version {
-            5 => v5::BlotterFile::read_after_save_version(reader).map(Self::V5),
+            v5::SAVE_VERSION => v5::BlotterFile::read_after_save_version(reader).map(Self::V5),
+            v6::SAVE_VERSION => v6::BlotterFile::read_after_save_version(reader).map(Self::V6),
             _ => Err(Error::IncompatibleVersion(save_version)),
         }
     }
@@ -26,6 +29,7 @@ impl BlotterFile {
     pub fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error> {
         match self {
             Self::V5(file) => file.write(writer),
+            Self::V6(file) => file.write(writer),
         }
     }
 }
diff --git a/src/v5.rs b/src/v5.rs
index 7fa2616..5f1a2f0 100644
--- a/src/v5.rs
+++ b/src/v5.rs
@@ -2,6 +2,8 @@ use crate::error::Error;
 use crate::io::*;
 use std::io::{Read, Write};
 
+pub const SAVE_VERSION: u8 = 5;
+
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum SaveType {
     World,
@@ -65,7 +67,6 @@ pub enum CircuitStates {
 
 #[derive(Debug)]
 pub struct BlotterFile {
-    pub save_version: u8,
     pub game_version: [i32; 4],
     pub save_type: SaveType,
     pub mods: Vec<ModInfo>,
@@ -78,7 +79,6 @@ pub struct BlotterFile {
 impl BlotterFile {
     pub fn new(game_version: [i32; 4]) -> Self {
         Self {
-            save_version: 5,
             game_version,
             save_type: SaveType::World,
             mods: Vec::new(),
@@ -95,7 +95,7 @@ impl BlotterFile {
         read_magic(reader, b"Logic World save")?;
 
         let save_version = read_u8(reader)?;
-        if save_version != 5 {
+        if save_version != SAVE_VERSION {
             return Err(Error::IncompatibleVersion(save_version));
         }
         Self::read_after_save_version(reader)
@@ -204,7 +204,6 @@ impl BlotterFile {
         read_magic(reader, b"redstone sux lol")?;
 
         Ok(Self {
-            save_version: 5,
             game_version,
             save_type,
             mods,
@@ -218,7 +217,7 @@ impl BlotterFile {
     pub fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error> {
         writer.write_all(b"Logic World save")?;
 
-        write_u8(self.save_version, writer)?;
+        write_u8(SAVE_VERSION, writer)?;
         for &v in &self.game_version {
             write_i32(v, writer)?;
         }
diff --git a/src/v6.rs b/src/v6.rs
new file mode 100644
index 0000000..3643691
--- /dev/null
+++ b/src/v6.rs
@@ -0,0 +1,326 @@
+use crate::error::Error;
+use crate::io::*;
+use std::io::{Read, Write};
+
+pub const SAVE_VERSION: u8 = 6;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum SaveType {
+    World,
+    Subassembly,
+}
+
+#[derive(Debug)]
+pub struct ModInfo {
+    pub mod_id: String,
+    pub mod_version: [i32; 4],
+}
+
+#[derive(Debug)]
+pub struct ComponentType {
+    pub numeric_id: u16,
+    pub text_id: String,
+}
+
+#[derive(Debug)]
+pub struct Input {
+    pub circuit_state_id: i32,
+}
+
+#[derive(Debug)]
+pub struct Output {
+    pub circuit_state_id: i32,
+}
+
+#[derive(Debug)]
+pub struct Component {
+    pub address: u32,
+    pub parent: u32,
+    pub type_id: u16,
+    pub position: [i32; 3],
+    pub rotation: [f32; 4],
+    pub inputs: Vec<Input>,
+    pub outputs: Vec<Output>,
+    pub custom_data: Option<Vec<u8>>,
+}
+
+#[derive(Debug)]
+pub struct PegAddress {
+    pub is_input: bool,
+    pub component_address: u32,
+    pub peg_index: i32,
+}
+
+#[derive(Debug)]
+pub struct Wire {
+    pub start_peg: PegAddress,
+    pub end_peg: PegAddress,
+    pub circuit_state_id: i32,
+    pub rotation: f32,
+}
+
+#[derive(Debug)]
+pub enum CircuitStates {
+    WorldFormat { circuit_states: Vec<u8> },
+    SubassemblyFormat { on_states: Vec<i32> },
+}
+
+#[derive(Debug)]
+pub struct BlotterFile {
+    pub game_version: [i32; 4],
+    pub save_type: SaveType,
+    pub mods: Vec<ModInfo>,
+    pub component_types: Vec<ComponentType>,
+    pub components: Vec<Component>,
+    pub wires: Vec<Wire>,
+    pub circuit_states: CircuitStates,
+}
+
+impl BlotterFile {
+    pub fn new(game_version: [i32; 4]) -> Self {
+        Self {
+            game_version,
+            save_type: SaveType::World,
+            mods: Vec::new(),
+            component_types: Vec::new(),
+            components: Vec::new(),
+            wires: Vec::new(),
+            circuit_states: CircuitStates::WorldFormat {
+                circuit_states: Vec::new(),
+            },
+        }
+    }
+
+    pub fn read<R: Read>(reader: &mut R) -> Result<Self, Error> {
+        read_magic(reader, b"Logic World save")?;
+
+        let save_version = read_u8(reader)?;
+        if save_version != SAVE_VERSION {
+            return Err(Error::IncompatibleVersion(save_version));
+        }
+        Self::read_after_save_version(reader)
+    }
+
+    pub(crate) fn read_after_save_version<R: Read>(reader: &mut R) -> Result<Self, Error> {
+        let game_version = read_version(reader)?;
+
+        let save_type_id = read_u8(reader)?;
+        let save_type = match save_type_id {
+            1 => SaveType::World,
+            2 => SaveType::Subassembly,
+            _ => {
+                return Err(Error::InvalidSave);
+            }
+        };
+
+        let num_components = read_usize(reader)?;
+        let num_wires = read_usize(reader)?;
+
+        let num_mods = read_usize(reader)?;
+        let mods = read_vec(num_mods, || {
+            let mod_id = read_string(reader)?;
+            let mod_version = read_version(reader)?;
+            Ok(ModInfo {
+                mod_id,
+                mod_version,
+            })
+        })?;
+
+        let num_component_types: usize = read_usize(reader)?;
+        let component_types = read_vec(num_component_types, || {
+            let numeric_id = read_u16(reader)?;
+            let text_id = read_string(reader)?;
+            Ok(ComponentType {
+                numeric_id,
+                text_id,
+            })
+        })?;
+
+        let components = read_vec(num_components, || {
+            let address = read_u32(reader)?;
+            let parent = read_u32(reader)?;
+            let type_id = read_u16(reader)?;
+            let position = read_array(|| read_i32(reader))?;
+            let rotation = read_array(|| read_f32(reader))?;
+
+            let num_inputs = read_usize(reader)?;
+            let inputs = read_vec(num_inputs, || {
+                let circuit_state_id = read_i32(reader)?;
+                Ok(Input { circuit_state_id })
+            })?;
+
+            let num_outputs = read_usize(reader)?;
+            let outputs = read_vec(num_outputs, || {
+                let circuit_state_id = read_i32(reader)?;
+                Ok(Output { circuit_state_id })
+            })?;
+
+            let custom_data_len = read_i32(reader)?;
+            let custom_data = if custom_data_len < 0 {
+                None
+            } else {
+                Some(read_bytevec(reader, custom_data_len as usize)?)
+            };
+
+            Ok(Component {
+                address,
+                parent,
+                type_id,
+                position,
+                rotation,
+                inputs,
+                outputs,
+                custom_data,
+            })
+        })?;
+
+        let wires = read_vec(num_wires, || {
+            let start_peg = read_peg_address(reader)?;
+            let end_peg = read_peg_address(reader)?;
+            let circuit_state_id = read_i32(reader)?;
+            let rotation = read_f32(reader)?;
+
+            Ok(Wire {
+                start_peg,
+                end_peg,
+                circuit_state_id,
+                rotation,
+            })
+        })?;
+
+        let circuit_states = match save_type {
+            SaveType::World => {
+                let num_bytes = read_usize(reader)?;
+                let circuit_states = read_bytevec(reader, num_bytes)?;
+                CircuitStates::WorldFormat { circuit_states }
+            }
+            SaveType::Subassembly => {
+                let num_on_states = read_usize(reader)?;
+                let on_states = read_vec(num_on_states, || read_i32(reader))?;
+                CircuitStates::SubassemblyFormat { on_states }
+            }
+        };
+
+        read_magic(reader, b"redstone sux lol")?;
+
+        Ok(Self {
+            game_version,
+            save_type,
+            mods,
+            component_types,
+            components,
+            wires,
+            circuit_states,
+        })
+    }
+
+    pub fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error> {
+        writer.write_all(b"Logic World save")?;
+
+        write_u8(SAVE_VERSION, writer)?;
+        for &v in &self.game_version {
+            write_i32(v, writer)?;
+        }
+        let save_type_id = match self.save_type {
+            SaveType::World => 1,
+            SaveType::Subassembly => 2,
+        };
+        write_u8(save_type_id, writer)?;
+
+        write_usize(self.components.len(), writer)?;
+        write_usize(self.wires.len(), writer)?;
+
+        write_usize(self.mods.len(), writer)?;
+        for mod_info in &self.mods {
+            write_str(&mod_info.mod_id, writer)?;
+            for &v in &mod_info.mod_version {
+                write_i32(v, writer)?;
+            }
+        }
+
+        write_usize(self.component_types.len(), writer)?;
+        for component_type in &self.component_types {
+            write_u16(component_type.numeric_id, writer)?;
+            write_str(&component_type.text_id, writer)?;
+        }
+
+        for component in &self.components {
+            write_u32(component.address, writer)?;
+            write_u32(component.parent, writer)?;
+            write_u16(component.type_id, writer)?;
+            for &v in &component.position {
+                write_i32(v, writer)?;
+            }
+            for &v in &component.rotation {
+                write_f32(v, writer)?;
+            }
+            write_usize(component.inputs.len(), writer)?;
+            for input in &component.inputs {
+                write_i32(input.circuit_state_id, writer)?;
+            }
+            write_usize(component.outputs.len(), writer)?;
+            for output in &component.outputs {
+                write_i32(output.circuit_state_id, writer)?;
+            }
+            if let Some(bytes) = &component.custom_data {
+                write_usize(bytes.len(), writer)?;
+                writer.write_all(&bytes)?;
+            } else {
+                write_i32(-1, writer)?;
+            }
+        }
+
+        for wire in &self.wires {
+            write_peg_address(&wire.start_peg, writer)?;
+            write_peg_address(&wire.end_peg, writer)?;
+            write_i32(wire.circuit_state_id, writer)?;
+            write_f32(wire.rotation, writer)?;
+        }
+
+        match (self.save_type, &self.circuit_states) {
+            (SaveType::World, CircuitStates::WorldFormat { circuit_states }) => {
+                write_usize(circuit_states.len(), writer)?;
+                writer.write_all(&circuit_states)?;
+            }
+            (SaveType::Subassembly, CircuitStates::SubassemblyFormat { on_states }) => {
+                write_usize(on_states.len(), writer)?;
+                for &v in on_states {
+                    write_i32(v, writer)?;
+                }
+            }
+            _ => {
+                return Err(Error::InvalidSave);
+            }
+        }
+
+        writer.write_all(b"redstone sux lol")?;
+        Ok(())
+    }
+}
+
+fn read_peg_address<R: Read>(reader: &mut R) -> Result<PegAddress, Error> {
+    let peg_kind = read_u8(reader)?;
+    let is_input = match peg_kind {
+        0 => false,
+        1 => true,
+        _ => return Err(Error::InvalidSave),
+    };
+    let component_address = read_u32(reader)?;
+    let peg_index = read_i32(reader)?;
+    Ok(PegAddress {
+        is_input,
+        component_address,
+        peg_index,
+    })
+}
+
+fn write_peg_address<W: Write>(address: &PegAddress, writer: &mut W) -> Result<(), Error> {
+    let peg_type_id = match address.is_input {
+        false => 0,
+        true => 1,
+    };
+    write_u8(peg_type_id, writer)?;
+    write_u32(address.component_address, writer)?;
+    write_i32(address.peg_index, writer)?;
+    Ok(())
+}