diff --git a/src/constants.rs b/src/constants.rs
index fbd701f..af8697b 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -59,6 +59,7 @@
 // //! [`FromStr`]: std::str::FromStr
 // //! [`Display`]: std::fmt::Display
 
+pub mod extra;
 pub mod numbers;
 pub mod prototypes;
 mod small_enums;
diff --git a/src/constants/extra.rs b/src/constants/extra.rs
index b338b83..d50d19b 100644
--- a/src/constants/extra.rs
+++ b/src/constants/extra.rs
@@ -6,58 +6,59 @@
 pub const CONSTRUCTION_SITE_STOMP_RATIO: f32 = 0.5;
 
 /// Maximum length of signs on controllers.
-pub const CONTROLLER_SIGN_MAX_LENGTH: u32 = 100;
+//pub const CONTROLLER_SIGN_MAX_LENGTH: u32 = 100;
 
 /// Maximum amount of CPU that can be accumulated in your bucket per shard.
-pub const CPU_BUCKET_MAX: u32 = 10_000;
+//pub const CPU_BUCKET_MAX: u32 = 10_000;
 
 /// Maximum value of [`CpuInfo::tick_limit`] if more bucket is available than
 /// can be used this tick.
 ///
 /// [`CpuInfo::tick_limit`]: crate::game::cpu::CpuInfo::tick_limit
-pub const CPU_TICK_LIMIT_MAX: u32 = 500;
+//pub const CPU_TICK_LIMIT_MAX: u32 = 500;
 
 /// Hits per creep body part.
 pub const CREEP_HITS_PER_PART: u32 = 100;
 
 /// Maximum length of names of creeps.
-pub const CREEP_NAME_MAX_LENGTH: u32 = 100;
+//pub const CREEP_NAME_MAX_LENGTH: u32 = 100;
 
 /// Maximum length of names of flag objects.
-pub const FLAG_NAME_MAX_LENGTH: u32 = 60;
+//pub const FLAG_NAME_MAX_LENGTH: u32 = 60;
 
 /// Maximum size in bytes (100 KiB) of the string contents allowed for inter
 /// shard memory.
-pub const INTER_SHARD_MEMORY_SIZE_LIMIT: u32 = 100 * 1024;
+//pub const INTER_SHARD_MEMORY_SIZE_LIMIT: u32 = 100 * 1024;
 
 /// Owner username of hostile non-player structures and creeps which create
 /// strongholds and spawn in rooms due to energy harvesting.
-pub const INVADER_USERNAME: &str = "Invader";
+//pub const INVADER_USERNAME: &str = "Invader";
 
 /// Maximum range from a lab to the input or output labs it's interacting with.
-pub const LAB_REACTION_RANGE: u32 = 2;
+//pub const LAB_REACTION_RANGE: u32 = 2;
 
 /// The maximum size (1000 KiB) of the serialized [`MapVisual`] data.
-pub const MAP_VISUAL_SIZE_LIMIT: u32 = 1000 * 1024;
+//pub const MAP_VISUAL_SIZE_LIMIT: u32 = 1000 * 1024;
 
-/// The maximum number of times that you can deal on market orders in a single tick.
-pub const MARKET_MAX_DEALS_PER_TICK: u32 = 10;
+/// The maximum number of times that you can deal on market orders in a single
+/// tick.
+//pub const MARKET_MAX_DEALS_PER_TICK: u32 = 10;
 
 /// Maximum size in bytes (100 KiB) of the string contents allowed in memory
 /// segments.
-pub const MEMORY_SEGMENT_SIZE_LIMIT: u32 = 100 * 1024;
+//pub const MEMORY_SEGMENT_SIZE_LIMIT: u32 = 100 * 1024;
 
 /// Maximum size in bytes (2 MiB) of the string contents allowed in memory.
-pub const MEMORY_SIZE_LIMIT: u32 = 2 * 1024 * 1024;
+//pub const MEMORY_SIZE_LIMIT: u32 = 2 * 1024 * 1024;
 
 /// Fatigue points removed per effective move part per tick.
 pub const MOVE_POWER: u32 = 2;
 
 /// Maximum hits of a power creep per level.
-pub const POWER_CREEP_HITS_PER_LEVEL: u32 = 1000;
+//pub const POWER_CREEP_HITS_PER_LEVEL: u32 = 1000;
 
 /// Maximum length of names of power creeps.
-pub const POWER_CREEP_NAME_MAX_LENGTH: u32 = 100;
+//pub const POWER_CREEP_NAME_MAX_LENGTH: u32 = 100;
 
 /// Hits of damage per effective ranged attack part per
 /// [`Creep::ranged_mass_attack`] action at range 1.
@@ -74,30 +75,3 @@ pub const RANGED_MASS_ATTACK_POWER_RANGE_2: u32 = 4;
 ///
 /// [`Creep::ranged_mass_attack`]: crate::objects::Creep::ranged_mass_attack
 pub const RANGED_MASS_ATTACK_POWER_RANGE_3: u32 = 1;
-
-/// The maximum size (500 KiB) of the serialized [`RoomVisual`] data for each
-/// room.
-///
-/// [`RoomVisual`]: crate::objects::RoomVisual
-pub const ROOM_VISUAL_PER_ROOM_SIZE_LIMIT: u32 = 500 * 1024;
-
-/// Maximum length of strings that creeps and power creeps can say.
-pub const SAY_MAX_LENGTH: u32 = 10;
-
-/// Owner username of hostile non-player structures and creeps which occupy sector center rooms.
-pub const SOURCE_KEEPER_USERNAME: &str = "Source Keeper";
-
-/// Maximum length of names of spawns.
-pub const SPAWN_NAME_MAX_LENGTH: u32 = 100;
-
-/// Exponential scaling rate for terminal energy costs.
-///
-/// Energy cost to send resources with a terminal is determined by the formula
-/// ([source]):
-///
-/// ```js
-/// Math.ceil(resource_amount * (1 - Math.exp(-range / 30)))
-/// ```
-///
-/// [source]: https://github.com/screeps/engine/blob/c682c00b058de21e927c3a6c42fadb34c9745767/src/utils.js#L658
-pub const TERMINAL_SEND_COST_SCALE: u32 = 30;