diff --git a/src/reskit/cli/evaluator.rs b/src/reskit/cli/evaluator.rs
index 07199c6..c93cd2f 100644
--- a/src/reskit/cli/evaluator.rs
+++ b/src/reskit/cli/evaluator.rs
@@ -1,6 +1,6 @@
-use std::{error::Error, fs::File, io::Write, path::Path};
+use std::{error::Error, fs::File, io::Write, path::Path, collections::HashMap};
 use clap::Parser;
-use crate::reskit::{tileset, soundtrack::{formats::dmf::DmfModule, engines::echo::engine::{EchoFormat, EchoArtifact}}, utility::{print_good, print_error, print_info}, level::{converter::get_tiled_tilemap, system::{get_tiles, get_code, get_tilemap, get_collision_map, get_ecs}}};
+use crate::reskit::{tileset, soundtrack::{formats::dmf::DmfModule, engines::echo::engine::{EchoFormat, EchoArtifact}}, utility::print_good, level::{converter::get_tiled_tilemap, system::{get_tiles, get_code, get_tilemap, get_collision_map, get_ecs}}};
 use super::settings::{Args, Tools, TileOutputFormat, TileOrder};
 
 pub fn run_command() -> Result<(), Box<dyn Error>> {
@@ -65,7 +65,49 @@ pub fn run_command() -> Result<(), Box<dyn Error>> {
 
             print_good( "all files converted successfully" );
         }
-        Tools::Level { input_file, output_directory, console: _ } => {
+        Tools::Level { input_file, output_directory, component_ids, attribute_ids, symbol_ids, console: _ } => {
+            // Clap can't do it. Sad!
+            let mut all_components: HashMap<String, u8> = HashMap::new();
+            let mut all_symbols: HashMap<String, u16> = HashMap::new();
+            let mut all_attributes: HashMap<String, Vec<String>> = HashMap::new();
+            for pair in component_ids {
+                let components: Vec<&str> = pair.split( "=" ).collect();
+                if components.len() != 2 {
+                    return Err( format!( "invalid format for component_ids: {}", pair ) )?;
+                }
+
+                let component_name = components[ 0 ];
+                let component_id: u8 = components[ 1 ].parse()?;
+
+                all_components.insert( component_name.to_owned(), component_id );
+            }
+            for pair in attribute_ids {
+                let components: Vec<&str> = pair.split( "=" ).collect();
+                if components.len() != 2 {
+                    return Err( format!( "invalid format for attribute_ids: {}", pair ) )?;
+                }
+
+                let component_name = components[ 0 ];
+                let attributes: Vec<String> = components[ 1 ].split( "," ).map( | string | string.to_owned() ).collect();
+
+                all_attributes.insert( component_name.to_owned(), attributes );
+            }
+            for pair in symbol_ids {
+                let symbols: Vec<&str> = pair.split( "=" ).collect();
+                if symbols.len() != 2 {
+                    return Err( format!( "invalid format for symbol_ids: {}", pair ) )?;
+                }
+
+                let symbol_name = symbols[ 0 ];
+                let symbol_id: u16 = symbols[ 1 ].parse()?;
+
+                all_symbols.insert( symbol_name.to_owned(), symbol_id );
+            }
+
+            let component_ids = all_components;
+            let attribute_ids = all_attributes;
+            let symbol_ids = all_symbols;
+
             let tiled_file = get_tiled_tilemap( &input_file )?;
 
             // Get tile and palette files
@@ -88,7 +130,7 @@ pub fn run_command() -> Result<(), Box<dyn Error>> {
             print_good( "exported collision.lvc" );
 
             let mut nametables_bin = File::create( format!( "{}objects.ecs", output_directory ) )?;
-            nametables_bin.write_all( &get_ecs( &tiled_file )? )?;
+            nametables_bin.write_all( &get_ecs( &tiled_file, &component_ids, &attribute_ids, &symbol_ids )? )?;
             print_good( "exported objects.ecs" );
 
             let mut code_asm = File::create( format!( "{}level.asm", output_directory ) )?;
diff --git a/src/reskit/cli/settings.rs b/src/reskit/cli/settings.rs
index 381a99d..ad28414 100644
--- a/src/reskit/cli/settings.rs
+++ b/src/reskit/cli/settings.rs
@@ -109,6 +109,18 @@ pub enum Tools {
         #[arg(short, long, default_value_t=String::from("./"))]
         output_directory: String,
 
+        /// Zero or more ECS component ID definitions (format: <component_name>=<u8>)
+        #[arg(long, num_args(0..))]
+        component_ids: Vec<String>,
+
+        /// Zero or more ECS component attributes (format: <component_name>=<attribute_1>, <attribute_2>, ...)
+        #[arg(long, num_args(0..))]
+        attribute_ids: Vec<String>,
+
+        /// Zero or more ECS symbol ID definitions (format: <symbol_name>=<u8>)
+        #[arg(long, num_args(0..))]
+        symbol_ids: Vec<String>,
+
         /// Console system type
         #[arg(short, long, value_enum, default_value_t=SystemType::Md)]
         console: SystemType
diff --git a/src/reskit/level/system.rs b/src/reskit/level/system.rs
index b3a3e30..088271c 100644
--- a/src/reskit/level/system.rs
+++ b/src/reskit/level/system.rs
@@ -1,4 +1,4 @@
-use std::{error::Error, convert::TryInto, cmp::max, num::ParseIntError};
+use std::{error::Error, convert::TryInto, cmp::max, num::ParseIntError, collections::HashMap};
 use image::GenericImageView;
 use linked_hash_map::LinkedHashMap;
 use linked_hash_set::LinkedHashSet;
@@ -220,25 +220,18 @@ pub fn get_collision_map( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Er
 /**
  * Get the entity-component system defined. If none is defined return an empty vec.
  */
-pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
+pub fn get_ecs( tilemap: &TiledTilemap, component_ids: &HashMap<String, u8>, attribute_ids: &HashMap<String, Vec<String>>, symbol_ids: &HashMap<String, u16> ) -> Result<Vec<u8>, Box<dyn Error>> {
     if tilemap.ecs.is_empty() {
         return Ok( vec![] )
     }
 
     let mut result: Vec<u8> = Vec::new();
 
-    // Build a complete set of component IDs and types
-    let mut component_ids: LinkedHashSet<String> = LinkedHashSet::new();
+    // Build a complete set of types
     let mut types: LinkedHashSet<LinkedHashSet<String>> = LinkedHashSet::new();
     for entity in &tilemap.ecs {
         // Get the list of components attached to this entity
-        // Sort alphabetically as order matters in LinkedHashSets
-        let mut components: Vec<String> = entity.components.keys().map( | id | id.to_lowercase() ).collect();
-        components.sort();
-        let components: LinkedHashSet<String> = components.into_iter().collect();
-
-        // Assign an index to each unique component id by inserting it into `component_ids`
-        component_ids.extend( components.clone() );
+        let components: LinkedHashSet<String> = entity.components.keys().map( | id | id.to_lowercase() ).collect();
 
         // Assign this unique combination of components a type id
         // by inserting it into `types`
@@ -264,7 +257,7 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
 
         for component in ecs_type {
             type_component_ids.push(
-                component_ids.iter().position( | value | component == value ).ok_or( "internal error: no component" )? as u8
+                *component_ids.get( component ).ok_or( format!( "invalid file: when building type table: undefined component \"{}\"", component ) )?
             );
         }
 
@@ -301,27 +294,6 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
         result.push( 0xFF );
     }
 
-    // Component Attribute Table
-    // Index all attribute values that do not parse to u16
-    let mut attribute_value_ids: LinkedHashSet<String> = LinkedHashSet::new();
-    for entity in &tilemap.ecs {
-        for ( _, component ) in &entity.components {
-            for ( _, attribute_value ) in &component.attributes {
-                // Handling various types from Tiled Editor
-                // * If it is "true" or "false", leave it alone. It will be articulated as 1 or 0.
-                // * If it can be parsed as a u16, leave it alone.
-                // * In all other cases, add to attribute_value_ids to create an index.
-                if attribute_value != "true" && attribute_value != "false" {
-                    let try_as_u16: Result<u16, ParseIntError> = attribute_value.parse();
-                    if let Err( _ ) = try_as_u16 {
-                        attribute_value_ids.insert_if_absent( attribute_value.clone() );
-                        print_info( &format!( "Attribute Value ID {}: \"{}\"", attribute_value_ids.len() - 1, attribute_value ) );
-                    }
-                }
-            }
-        }
-    }
-
     // Find the largest size of a combination of attributes (the component attribute union size)
     let largest_type_attributes_size = tilemap.ecs.iter()
                                                   .map( | entity | {
@@ -341,35 +313,32 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
 
     // For (Object Table Size):
     for entity in &tilemap.ecs {
-        // (Component Attribute Union Size) bytes: Component attribute settings
-        // Sort components in this entity alphabetically, ascending
-        let mut components: Vec<(&String, &Component)> = entity.components.iter().collect();
-        components.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
-
         let mut written_attributes = 0;
-        for ( _, component ) in &components {
-            // Sort attributes in each component alphabetically
-            let mut attributes: Vec<(&String, &String)> = component.attributes.iter().collect();
-            attributes.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
 
-            for ( _, attribute_value ) in attributes {
-                written_attributes += 1;
-                match attribute_value.as_str() {
-                    "true" => result.extend( ( 1 as u16 ).to_be_bytes() ),
-                    "false" => result.extend( ( 0 as u16 ).to_be_bytes() ),
-                    string => {
-                        let try_as_u16: Result<u16, ParseIntError> = string.parse();
-                        if let Ok( numeric ) = try_as_u16 {
-                            result.extend( numeric.to_be_bytes() );
-                        } else {
-                            let id: u16 = attribute_value_ids.iter()
-                                                            .position( | attribute_value | attribute_value == &string )
-                                                            .ok_or( "internal error: no type id" )? as u16;
+        for ( component_id, component ) in &entity.components {
+            let attributes_in_order = attribute_ids.get( component_id );
+            if let Some( attributes_in_order ) = attributes_in_order {
+                for attribute_id in attributes_in_order {
+                    let attribute_value = component.attributes.get( attribute_id ).ok_or( format!( "invalid file: undefined attribute \"{}\" for component \"{}\"", attribute_id, component_id ) )?;
 
-                            result.extend( id.to_be_bytes() );
+                    written_attributes += 1;
+                    match attribute_value.as_str() {
+                        "true" => result.extend( ( 1 as u16 ).to_be_bytes() ),
+                        "false" => result.extend( ( 0 as u16 ).to_be_bytes() ),
+                        string => {
+                            let try_as_u16: Result<u16, ParseIntError> = string.parse();
+                            if let Ok( numeric ) = try_as_u16 {
+                                result.extend( numeric.to_be_bytes() );
+                            } else {
+                                let id: u16 = *symbol_ids.get( string ).ok_or( format!( "invalid file: undefined symbol \"{}\"", string ) )?;
+
+                                result.extend( id.to_be_bytes() );
+                            }
                         }
                     }
                 }
+            } else {
+                print_info( &format!( "component \"{}\" has no defined attributes (command line option --attribute-ids)", component_id ) );
             }
         }
 
@@ -388,46 +357,6 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
         }
     }
 
-    // Output IDs to terminal
-    let component_ids: Vec<String> = component_ids.into_iter().collect();
-    for i in 0..component_ids.len() {
-        print_info( &format!( "Component ID {}: {}", i, component_ids[ i ] ) );
-    }
-
-    // Output type structures to terminal
-    let mut visited_types: LinkedHashSet<LinkedHashSet<String>> = LinkedHashSet::new();
-    for entity in &tilemap.ecs {
-        // Do the thing again
-        let mut components: Vec<String> = entity.components.keys().map( | id | id.to_lowercase() ).collect();
-        components.sort();
-        let components: LinkedHashSet<String> = components.into_iter().collect();
-
-        if visited_types.insert( components.clone() ) {
-            // What type id is this?
-            let type_id: u8 = types.iter().position( | ecs_type | ecs_type == &components ).ok_or( "internal error: no type id" )? as u8;
-            print_info( &format!( "Type ID {} Components and Attributes:", type_id ) );
-
-            let mut components: Vec<(&String, &Component)> = entity.components.iter().collect();
-            components.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
-
-            for ( component_name, component ) in components {
-                print_info( &format!( "\tComponent {}", component_name ) );
-                let mut attributes: Vec<(&String, &String)> = component.attributes.iter().collect();
-                attributes.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
-
-                let mut index = 0;
-                for ( attribute_name, _ ) in &attributes {
-                    print_info( &format!( "\t\tAttribute ID {}: {}", index, attribute_name ) );
-                    index += 1;
-                }
-
-                if attributes.is_empty() {
-                    print_info( "\t\tNo attributes" );
-                }
-            }
-        }
-    }
-
     Ok( result )
 }
 
@@ -437,7 +366,6 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
 pub fn get_code( tilemap: &TiledTilemap, level_name: &str, path_prefix: &str ) -> Result<String, Box<dyn Error>> {
     let version = env!( "CARGO_PKG_VERSION" );
     let level_label = symbol_to_pascal( level_name );
-    let level_label_const_caps = level_label.to_uppercase();
     let ( width, height ) = ( tilemap.width, tilemap.height );
     let num_tiles = {
         let mut total_tiles = 0;
@@ -448,71 +376,9 @@ pub fn get_code( tilemap: &TiledTilemap, level_name: &str, path_prefix: &str ) -
 
         total_tiles
     };
-
-    let mut constants: String = String::new();
-
-    // Output IDs for each type defined in the map
-    let mut component_ids: LinkedHashSet<String> = LinkedHashSet::new();
-    let mut attribute_ids: LinkedHashMap<String, LinkedHashSet<String>> = LinkedHashMap::new();
-    let mut attribute_string_values: LinkedHashSet<String> = LinkedHashSet::new();
-    for entity in &tilemap.ecs {
-        let mut components: Vec<String> = entity.components.keys().map( | id | id.to_lowercase() ).collect();
-        components.sort();
-        let components: LinkedHashSet<String> = components.into_iter().collect();
-
-        component_ids.extend( components );
-
-        for ( component_name, component ) in &entity.components {
-            for ( _, attribute_value ) in &component.attributes {
-                match attribute_value.as_str() {
-                    "true" | "false" => { /* nothing */ },
-                    string => {
-                        let try_as_u16: Result<u16, ParseIntError> = string.parse();
-                        if let Err( _ ) = try_as_u16 {
-                            attribute_string_values.insert_if_absent( attribute_value.to_owned() );
-                        }
-                    }
-                }
-            }
-
-            let mut attributes: Vec<String> = component.attributes.keys().map( | id | id.to_lowercase() ).collect();
-            attributes.sort();
-            let attribues: LinkedHashSet<String> = attributes.into_iter().collect();
-
-            attribute_ids.entry( component_name.to_owned() ).or_default().extend( attribues );
-        }
-    }
-
-    let attribute_string_values: Vec<String> = attribute_string_values.into_iter().collect();
-    for i in 0..attribute_string_values.len() {
-        let attr_val = &attribute_string_values[ i ];
-        match attr_val.as_str() {
-            "true" | "false" => { /* nothing */ },
-            string => {
-                let try_as_u16: Result<u16, ParseIntError> = string.parse();
-                if let Err( _ ) = try_as_u16 {
-                    constants += &format!( "{}_ATTR_{} = {}\n", level_label_const_caps, attribute_string_values[ i ].to_uppercase(), i );
-                }
-            }
-        }
-    }
-
-    let component_ids: Vec<String> = component_ids.into_iter().collect();
-    for i in 0..component_ids.len() {
-        let component_id = &component_ids[ i ];
-        constants += &format!( "{}_{} = {}\n", level_label_const_caps, component_id.to_uppercase(), i );
-
-        let attribute_ids: Vec<String> = attribute_ids[ component_id ].iter().map( | string | string.clone() ).collect();
-        for i in 0..attribute_ids.len() {
-            constants += &format!( "{}_{}_{} = {}\n", level_label_const_caps, component_id.to_uppercase(), attribute_ids[ i ].to_uppercase(), i );
-        }
-
-    }
-
     let file = format!( r#"; Level definition file
 ; Generated by reskit v{version}
 
-{constants}
 {level_label}Tiles:
     incbin '{path_prefix}{level_name}/tiles.bin'