Cave Story Modding Wiki
Menu (Edit): Pages (Latest 5 updated) :
Contents:
  1. TSC
    1. TSC Commands
      1. Freeware
      2. Cave Story+ (PC, 2011)
      3. Cave Story+ (Switch)
      4. Cave Story+ (Steam, 2026)
      5. Notes
    2. Argument lists
      1. Direction (<FAI, <FAO)
      2. Equip flags (<EQ+, <EQ-):
      3. Player Character’s outfits (<MYC, CS+ 2026)
    3. References

TSC

The term TSC is shorthand for Text SCript, which is the custom scripting language that schedules and executes events within Cave Story:

  • It can control things like NPC states, game events, and map transitions.
  • Script files end with the .tsc file extension (except for CaveStory3D which uses .sgs instead).
  • Map scripts are found in the stage folder.
  • A script is made up of two parts: Events and Commands. An event looks like #0100 by itself on a line, and when that event is ran it will run every command starting underneath that line up until it encounters an <END command, a <TRA command to transition to another map, an <INI or <ESC which re-initializes or exits the game respectively, an <LDP which loads the saved profile.dat, or any of the several commands which jumps to another event, such as <EVE or <FL+. If there is nothing to end, exit, or jump out of an event, it will continue running into the next lines and possibly even out of the script entirely, leading to unstable behavior.
  • There are four special scripts found in the base “data” folder:
    • Head.tsc : A global file that is appended to the TOP of every map script. In vanilla, you will see that Head.tsc goes up to event #0049 while Map Events start around event #0090. You can expand Head.tsc but make sure that the smallest event in every map is larger than the largest event in Head.tsc (there’s no overlap when the files are appended).
    • ArmsItems.tsc : Used for all inventory text and scripting. “Arms” refers to weapons.
    • Credits.tsc : Used as part of the credits. This file actually uses a seperate, concurrent parser that has a different format than the one listed below. It runs in tandem with the normal script parser and is the ONLY time two scripts will run concurrently (the map scripts handling illustrations (<SIL and <CIL) and map cutscenes while Credits.tsc handles the scrolling text and icons).
    • StageSelect.tsc : Used for the names of Teleporter options when running the <SLP command. This is only used when the selection menu is on screen and does not contain the scripting for handling what happens when an option is selected.
  • Script sizes can be a maximum of 17,999 characters (including spaces and line returns). This is for the buffer that combines BOTH Head.tsc and the Map Script, so the combined size cannot exceed 17,999 characters. There are ways to increase this limitation.
  • Commands are of the form <CMDwwww:xxxx:yyyy:zzzz. The first 3 letters after the < denote which command is being used, and each command has a set number of arguments (denoted by example letters here). Each argument is and must be 4 numerical digits, and are seperated by an ignored character. Standard practice (taken from the original vanilla scripts) is to use : colons to seperate arguments, but technically anything can be used as a seperator as it will be ignored.
  • ALL arguments and event numbers must be four digits in length. This means that event 250 MUST be formatted as #0250 and CANNOT be formatted as #250. Same with arguments, where <AM+0010:0020 is correct but <AM+10:20 is not and will cause problems.
  • Events MUST BE IN ASCENDING NUMERICAL ORDER. Event #0310 must come after Event #0200 and be before Event #0320. You can skip events but they must be in order.
  • You cannot use < or # in your events for anything other than denoting Event Numbers and the start of a Command. This means that outside of patching or changing game behavior, one cannot display these two special characters in a textbox.

TSC Commands

Freeware

Here is a list of all the TSC commands that are found in the 2004 Freeware version in alphabetical order. All other versions of Cave Story and Cave Story+ support these commands, though the implementation details may differ.

Command Format Command Name Description
<AE+ Arms Energy + Refill all weapon ammo.
<AM+wwww:xxxx ArMs + Give weapon W (if not already acquired), and add X ammo. Use 0000 for infinite ammo.
<AM-wwww ArMs - Remove weapon W. Does nothing if not acquired.
<AMJwwww:xxxx ArMs Jump Jump to event X if the PC has weapon W. Otherwise if they don’t have weapon W it will continue to the next event.
<ANPwwww:xxxx:yyyy Animate NPc Give all entities with event W scriptstate X and direction Y. Used for animation. See Direction.
<BOAwwww BOss Animate Give the Map Boss (eg. Omega) scriptstate W
<BSLwwww Boss Show Life Displays a boss health bar for the entity with event W. Only one can display at a time. Use <BSL0000 for the Map Boss (eg. Omega) if one is set for the map. You usually need an <ANP or <BOA to actually make the boss start attacking.
<CAT Clear Auto Turbo Instantly displays text. Use before a <MSG/2/3; works until <END. Same command as <SAT; evidence suggests it was MEANT to disable <SAT but it is bugged to be an exact clone of it.
<CIL Clear ILlustration Clear illustration (during credits).
<CLO CLOse Close message box. Certain other commands like <END will also close it.
<CLR CLeaR Clears the message box but does not close it. Certain other commands like <END will also close it.
<CMPwwww:xxxx:yyyy Change MaP tile Change the tile at coordinates W:X to type Y. Produces smoke.
<CMUwwww Change MUsic Change music to song W. Use <CMU0000 to stop the music (technically it plays a silent looping track).
<CNPwwww:xxxx:yyyy Change NPc Change all entities with event W to type X with direction Y. See direction table above.
<CPS Clear vProp. **Sound Stops the propeller sound from <SPS.
<CRE CREdits Rolls credits. Specifically starts parsing Credits.tsc seperately to start displaying scrolling text and icons, but the event continues running (eg. you’ll need to use <SIL and <CIL to display the half-screen images).
<CSS Clear Stream Sound Stops the stream sound from <SSS.
<DNAwwww Delete Npc All Remove all entities of TYPE W.
<DNPwwww Delete NPc Remove all entities with EVENT W. Note that killing or deleting an NPC will set its assigned flag.
<ECJwwww:xxxx Event Check Jump Jumps to event X if any entities with event W exist. Use <NCJ instead for checking NPC TYPE.
<END END End the current scripted event. Most of your events must end with this command unless it uses another acceptable command such as <TRA or <EVE.
<EQ+wwww EQuip + Set Equip flag W. These are for equipping items (eg. The Booster 2.0 or Arms Barrier) but these are not the same as the item IDs used in <IT+. See Equip flags.
<EQ-wwww EQuip - Unsets (removes) Equip flag W. See Equip flags.
<ESC ESCape Quit to title screen. Any other commands after this one within the same event will be ignored.
<EVEwwww EVEnt Go to event W. Any other commands after this one within the same event will be ignored.
<FACwwww FACe Show facepic (face picture) W in the message box. Use <FAC0000 to remove the facepic. Note that with a facepic active you will have less characters that can be displayed per line. You may need to use <FAC before the <MSG/2/3 if you’re switching from one character to another and don’t want it to flash the wrong facepic for a frame.
<FAIwwww FAde In Fade in with direction W. See Direction.
<FAOwwww FAde Out Fade out with direction W.
<FL+wwww FLag + Sets Event Flag W. The valid and safe Event Flags to use are between 0001 and 7999 inclusive. Using anything other than that could access Out Of Bounds (OOB) memory or have adverse effects.
<FL-wwww FLag - Clears/Unsets Event Flag W.
<FLA FLAsh Flash the screen white.
<FLJwwww:xxxx FLag Jump Jump to event X if Event Flag W is set. Otherwise if NOT set it will continue to the next command.
<FMU Fade MUsic Fade the current music out.
<FOBxxxx:yyyy Focus On Boss Focus on Map Boss part W with a camera speed of X. The smaller the number X is the faster it will follow, but it MUST be higher than 0. The W in this command isn’t really documented so you probably just want to use 0000 for W to focus on the main part of the Map Boss.
<FOMxxxx Focus On Me Focus on player with a camera speed of X. The original vanilla games uses <FOM0016 as the default camera state.
<FONw:xxxx Focus On Npc Focus on entity with event W with a camera speed of X.
<FRE FREe Free game action and the PC. Specifically it undoes <KEY and <PRI without ending the event. Note that the player is invincible while an event is running (except for tile spikes).
<GITwwww Graphic ITem Display an item or weapon icon above the message box. Add 1000 to W for items. Use 0000 to remove.
<HMC Hide My Character Hides the PC. Essentially disables running any player code at all as if they temporarily don’t exist including physics. They will freeze in place invisibly.
<INI INItialize Resets memory and restarts into a new game. NOTE there is a bug where it will skip the first 4 characters of the starting event.
<INPwwww:xxxx:yyyy Interactible NPc Change (all?) entities with event W to type X with direction Y and set entity bitflag 100 (0x8000). In other words, this is the exact same as <CNP but it will make the NPC interactible.
<IT+xxxx ITem + Gives item W to the player if they don’t already have it, adding it to their inventory and playing a sound.
<IT-xxxx ITem - Removes item W. Does nothing if they don’t have it.
<ITJwwww:xxxx ITem Jump Jump to event X if the PC has item W. Otherwise if they don’t have item W it will continue to the next event.
<KEY KEY lock Lock player controls and hide status bars until <END or <FRE.
<LDP LoaD Profile Loads the saved game. Any commands after this one within the same event will be ignored. By default
<LI+xxxx LIfe + Recover W health. This cannot go over Max Health. The original vanilla game uses <LI+1000 to fully heal the player.
<ML+xxxx Max Life + Increase the current and maximum health by W.
<MLP Map/Location Picture Displays a map of the current area. This can have visual glitches if not run in the inventory script ArmsItems.tsc. Use <EQ+0002 to allow the player to press the ‘W’ key or controller equivalent to display the map any time they want.
<MM0 My Motion 0 Halt the PC’s forward motion. Used in cutscene triggers to stop the player in mid-air and have them drop straight-down instead of keeping their momentum and having them fall PAST the trigger.
<MNA Map NAme Displays the name of current map.
<MNPwwww:xxxx:yyyy:zzzz Move NPc Move entity with event W to coordinates X:Y with direction Z.
<MOVxxxx:yyyy MOVe Move the PC to coordinates X:Y.
<MP+wwww MaP flag + Sets Map Flag W. NOTE that Map Flags are an unused mechanic of the game. Map flags cannot be unset. Highest usable flag is 127.
<MPJxxxx MaP flag Jump Jump to event W if the map flag FOR THE CURRENT MAP is set.
<MS2 MeSsaGe 2 Opens an invisible message box at the top of screen.
<MS3 MeSsaGe 3 Opens a message box at the top of screen.
<MSG MeSsaGe 1 Opens a message box at the bottom of the screen.
<MYBwwww MY Bump Causes the PC to hop in the direction OPPOSITE of W. Using up or down causes the jump to be vertical.
<MYDwwww MY Direction Causes the PC to face direction W. 0 through 3 follows the directions outlined in the direction table. Directions between 10 and 255 will make the PC face the direction of an NPC with a matching event number.
<NCJwwww:xxxx Npc Check Jump Jumps to event X if any entity of TYPE W exists. Use <ECJ instead for checking an npc event number.
<NOD Newline On Demand / Player NODs Wait for player input before resuming script.
<NUMwwww NUMber Prints the value 0x4a5b34+W*4 to the message box. Use 0000 to print the last used W from compatible commands (eg AM+).
<PRI PRevent Interaction Lock player controls and FREEZE the game action until <KEY (unfreezes game) or <FRE or <END.
<PS+wwww:xxxx Portal Slot + Set teleporter slot W to event X. Selecting slot W while using the teleporter menu will jump to event X. Valid slots are 0 through 6.
<QUAwwww QUAke Shake the screen for W ticks. Ticks are determined by FPS, so 50 ticks equals 1 second when the game runs at 50 FPS.
<RMU Resume MUsic Resume the song last played. Generally used for resuming after playing a short jingle.
<SAT Speed-up All Text Instantly display text. Use before a <MSG/2/3; works until <END. Functionally the same command as <CAT.
<SILwwww Show ILlustration Show illustration W (during credits).
<SK+wwww SKipflag + Sets skipflag W. Valid values are 0 through 63 inclusive. Skipflags are preserved while the game is running, even when reloading a save. They do not save to the save file. Used to skip lengthy cutscenes if the player saw it once and then died.
<SK-wwww SKipflag - Clears/Unsets skipflag W.
<SKJwwww:xxxx SKipflag Jump Jumps to event W if skipflag X is set.
<SLP Show Location Portals Shows the teleporter menu. I’m pretty sure(?) this will ignore any following commands after this one within the same event (since selecting an option will run a different event), but maybe it continues if you select nothing.
<SMC Show My Character Unhides the PC after a <HMC. You want to use this after a Balrog bossfight as he essentially performs an internal <HMC when he grabs the PC.
<SMPxxxx:yyyy Shift/Subtract MaP tile Subtracts 1 from the Tile ID at coordinate X:Y, making it transform into the tile to its left in the tile sheet. This means Right-to-Left and Bottom-to-Top. Does not create smoke.
<SNPwwww:xxxx:yyyy:zzzz Spawn NPc Create an entity of type W at coordinates X:Y with direction Z. This entity will have event and flag 0000, meaning you can’t reference it with any other commands. Use <CNP on an invisible null entity to make an NPC suddenly appear that you can reference in other commands.
<SOUwwww SOUnd Play sound effect W.
<SPS Start Prop. Sound Starts the looping propeller sound. Use <CPS to stop.
<SSSwwww Start Stream Sound Starts the stream sound with pitch W. The original game’s Waterway uses 0400. Use <CSS to stop.
<STC Save Time Counter Saves current time to 290.rec. This does not remove the timer. Use <EQ-0256 to later remove the timer from the screen.
<SVP SaVe Profile Saves current game. Note that you can run into issues if you don’t use <FL+0431 before you <SVP, unless you edit some events in Head.tsc to force the jumps in events 0040 through 0042.
<TAMwwww:xxxx:yyyy Trade ArMs Trades weapon W for weapon X and sets max ammo to Y. Use 0000 to keep the same amount of ammo.
<TRAwwww:eeee:xxxx:yyyy TRAnsport Travels to map W, runs event E in the map you travel to, and moves the PC to coordinates X:Y. Make sure that event E exists in map W!
<TUR TURbo Instantly displays text. Use after a <MSG/2/3; works until another <MSG/2/3 or an <END.
<UNIwwww UNIverse Sets character movement type W. Use 0000 for normal, 0001 for Zero Gravity like in the Ironhead fight (this will disable FOM from being able to follow the player), and 0002 to freeze the player in place but still allow them to point in directions and shoot weapons.
<UNJwwww:xxxx UNiverse Jump Jump to event X if movement type is of type W (from the above command).
<WAIwwww WAIt Pause script for W ticks. Ticks are determined by FPS, so 50 ticks equals 1 second when the game runs at 50 FPS. Any number between 0 and 3 inclusive is inconsistent.
<WAS WAit until Standing Pauses script until character is on ground. Will softlock the game if the PC is unable to touch the ground.
<XX1wwww XX1 Show the island falling in manner W. Use 0000 to have it crash and 0001 to have it stop midway.
<YNJwwww Yes/No Jump Prompt Yes/No; jump to event W if No is selected.
<ZAM Zero ArMs Sets all weapon levels to zero.

Cave Story+ (PC, 2011)

Command Format Command Name Description
<ACHxxxx ACHievement Get achievement X. Triggers Steam achievement; no-op in other versions.

Cave Story+ (Switch)

Command Format Command Name Description
<ACHxxxx ACHievement Unlock achievement X.
<2MVwwwx 2P MoVe Moves the other player to the player that triggered this event. Also generates 4 smoke entities at that location. If W < 11, the other player is moved to one block away from this player. Otherwise, the other player is moved to WWW pixels away from this player. If X is 1, the other player is moved to the right side of this player; otherwise they are moved to the left side.
<2PJxxxx 2P Jump Jump to event X if in 2-player mode.
<FR2 FRee 2 Exits the multi-page item description state (undoes <KE2).
<FF-xxxx:yyyy First Flag - Unsets the first set flag in the range from X to Y (inclusive).
<HM2 Hide My character 2 Hides only the player that triggered this event (unlike <HMC, which hides both).
<I+Nxxxx:yyyy Item + Number Adds item X with maximum amount of Y. For instance <I+N0014:0002 adds one of item 14 but doesn’t let the item count go higher than 2.
<INJxxxx:yyyy:zzzz Item Number Jump Jump to event Z if player has at least Y quantity of item X.
<KE2 KEy 2 Enters the multi-page item description state. In this state the OK button doesn’t restart the item description event (resets when the cursor is moved, however it does not prevent the cancel button from exiting the inventory).
<POP POP Restores read position from top of event stack.
<PSHxxx PuSH Saves the next read position to a stack and then jumps to event xxxx.
<RFW Rapid Fire Weapon Enable rapid firing of weapons. Normally, this only affects the Polar Star. Not used in the Switch version.
<RSP Reset Secondary Position Moves all players to the first player’s position. Not used in the Switch version.

Cave Story+ (Steam, 2026)

Includes all commands from CS+ for Switch, and also adds the following:

Command Format Command Name Description
<MYCxxxx MY Character Changes the PC’s character. See Player Character’s outfits.
<XX2xxxx XX2 Sets TimgXXXX.png over the screen. The “tag” (xxxx) for the file name must be exactly 4 characters.

Notes

  • Invalid commands show an error message displaying the command before the game exits. Unless patched in Freeware, this error text will will be in Japanese, which if your computer is not set to the Japanese Locale, it will display Mojibake gibberish.
  • There is no <EQJ to jump to an Event if an Equip Flag is set. In the original vanilla game, both Booster versions and the Whimsical Star use an arbitrary Event Flag (<FLJ) in ArmsItem.tsc to determine if the item is equipped or not.
  • CS+ Switch supports a max of 32 events on the stack.

For editing TSC, please see the sub-section.

Argument lists

Direction (<FAI, <FAO)

#### Direction (<FAI and <FAO) Direction (NPC Commands)
0000 Left Left
0001 Up Up
0002 Right Right
0003 Down Down
0004 Center Attempts to make them face the player by giving 0000 to face left or 0002 to face right.
0005 INVALID Ignored/Unchanged. An NPC with direction 3 and transformed into another with <CNPwwww:xxxx:0005 will keep direction 3.

Equip flags (<EQ+, <EQ-):

#### Name Item id Notes
0001 Booster v0.8 0018 Ignored if v2.0 on
0002 Map System 0002  
0004 Arms Barrier 0019  
0008 Turbocharge 0020  
0016 Curly’s Air Tank 0021  
0032 Booster v2.0 0023  
0064 Mimiga Mask 0024  
0128 Whimsical Star 0038  
0256 Nikumaru Counter 0022  

Player Character’s outfits (<MYC, CS+ 2026)

#### Outfit
0001 Quote
0002 Curly
0003 King
0004 Sue
0005 Professor Booster
0006 Toroko
0007 Killer robot
0008 Curly Clone

All other values, including invalid ones, reset the outfit to the default.

References

  1. Description of commands from CS+ (Steam, 2026): https://github.com/Clownacy/boosters-lab-csplus-2026/raw/f6909e254b88e8f045eb595e6d8b1e14a3f44fea/tsc_list.txt
  2. The first description of CS+ (Switch) commands (has a bit more detail): https://doukutsu-rs.gitbook.io/docs/references/cs+-switch-reference#tsc-behavior-details-by-periwinkle-on-discord