Jazz Jackrabbit 2 Online

Jazz Jackrabbit 2 stores a lot of game information in the computer’s memory. Various programs edit the values stored in the memory to enhance the gameplay. All memory locations are given in hexadecimal.

Basic Information

Units

• Boolean means a 1-byte value (0 or 1, often used to mean true or false)
• Byte means a 1-byte value, ranging from 0..255, or -127..128 when signed.
• Integer means a 4-byte value (a signed number), short a 2-byte value
• String An array of type Byte representing a sequence of characters. These are ansi formatted (no unicode).
• 1 pixel → 2¹⁶ microtwip
• 1 tile → 32 pixels → 2²¹ microtwips
• 1 second → 70 gameticks

Calculating between versions

Something that seems to work in most cases is using the adress you know for 1.23 to calculate the one for 1.24. This doesn’t always work, but the formula is:

1.23 + 0×23620 = TSF
TSF – 0×23620 = 1.23

1.23

Player-dependent memory addresses

These are memory variables for which each player has a different address. The addresses here are given for player 1, but they can be shifted to the other players by adding 5A4 to the memory addresses. For example, the address for Player 4’s X-position would be:
5A4EEC + (3*5A4) = 5A5FD8.
This is however not always the case. For example when handling connections the offset is +1AC.

Address	Type	Description
5A4EEC	Integer	X-position in microtwips.
5A4EF0	Integer	Y-position in microtwips.
5A4EF6	Short	X-speed.
5A4EFA	Short	Y-speed.
5A4F14	Short	The current animation your character is playing (read-only).
5A4F1A	Byte	Freezetime.
5A4F1E	Byte	Health (Range: 0 to 5).
5A4F28	String	Player name (maximal length: 24).
5A4F68	Integer	Whether the player is flying. Possible values: -1 for airboard, 0 for no flight, 1 for helicopter ears.
5A4F94	Integer	Number of double jumps already used
5A501C	Integer	Fastfire: the fastfire delay of the player.
5A5028	Integer	The current weapon the player is using (Range: 0 to 9, 11,12,13 for ‘secret’ weapons).
5A5080	Integer	The amount of lives someone has.
5A508C	Integer	How much blink time the player has left, measured in gameticks.
5A52A8	Integer	The current player score (when in singleplayer mode).
5A52AC	Integer	Echo/shadow of the previous value (score).
5A52B0	Integer	The amount of gobbled food. Every 100 the player gets a sugar rush.
5A52B4	Integer	The amount of coins picked up.
5A52B8	Integer	The amount of gems picked up.
5A52E0	Integer	Ammo for weapon 1 (Blaster).
5A52E4	Integer	Ammo for weapon 2 (Bouncers).
5A52E8	Integer	Ammo for weapon 3 (Etcetera).
5A52EC	Integer	Ammo for weapon 4.
5A52F0	Integer	Ammo for weapon 5.
5A52F4	Integer	Ammo for weapon 6 (multiplied with 32).
5A52F8	Integer	Ammo for weapon 7.
5A52FC	Integer	Ammo for weapon 8.
5A5300	Integer	Ammo for weapon 9.
5A5308	Boolean	Whether weapon 1 is powered up or not (0 or 1).
5A5309	Boolean	Whether weapon 2 is powered up or not (0 or 1).
5A530A	Boolean	Whether weapon 3 is powered up or not (0 or 1).
5A530B	Boolean	Whether weapon 4 is powered up or not (0 or 1).
5A530C	Boolean	Whether weapon 5 is powered up or not (0 or 1).
5A530D	Boolean	Whether weapon 6 is powered up or not (0 or 1).
5A530E	Boolean	Whether weapon 7 is powered up or not (0 or 1).
5A530F	Boolean	Whether weapon 8 is powered up or not (0 or 1).
5A5310	Boolean	Whether weapon 9 is powered up or not (0 or 1).
5A534C	Integer	The shield currently selected.
5A5350	Integer	Amount of shield time left, measured in gameticks.
5A535C	Integer	The current player character, stored as the index of their animation set in Anims.j2a. (1.23: Jazz=54, Spaz=85, Bird=8, Frog=46. 1.24: Jazz=55, Spaz=89, Lori=61, Bird=8, Frog=47.)
5A5360	Integer	The original player character (before possible morphing).
5A539C	Integer	The amount of sugar rush time left, measured in gameticks.
5A53D2	Short	Camera Position X
5A4F74	Short	Camera Position Y
5A5410	Integer	The amount of roasts the player has.
5A544C	Integer	Fur color.
5A5458	Integer	The team the player is on. (0=Blue, 1=Red).
5A545C	Integer	Has flag? (0=No flag, other=Object ID of flag).
5A5464	Integer	The ID of the socket the game is currently using.
5A5468	Integer	The player number within the local computer itself (range: 0 to 3).
5A546C	Integer	Player in F9-list (0=Player doesn’t exist, 2=Otherwise).
5FB21C	Integer	Player connected (5=True, 0=False, 1=muted, uses 1AC as offset).

Global memory addresses

These memory addresses store general information about JJ2. Modifying them will affect every player on the computer.

Address	Type	Description
4CA910	Boolean	Playernames visible or not (same as F8)
4CDA24	String	Version of JJ2 that is running.
4D3E30	Integer	Whether the sounds are muted or not. (0=muted, 1=unmuted)
4D3E34	Integer	Whether the music is muted or not. (0=muted, 1=unmuted)
4F8E10	HINSTANCE	JJ2’s instance handle.
4F8E1C	HWND	JJ2’s window handle.
4F8E44	HMENU	JJ2’s menu handle.
514DAC	Integer	Level width in tiles.
518E0C	Integer	Level height in tiles.
52A522	Boolean	Game loop running or not.
58A5A0	Integer	How long the gameloop has been running, in gameticks.
547313	String	Current level name.
547373	String	The filename of the next level.
5473b3	String	Level music.
57AA40	Integer	No wallclipping (jjnowall effect, 1=True, 0=False).
58A641	String	Chatstring
5A4740	Integer	Score for the blue team.
5A4744	Integer	Score for the red team.
5A4B64	Integer	simulates F9
5A4B68	Integer	Game mode (0=Singleplayer, 1=Cooperative, 2=Battle, 3=Race, 4=Treasure, 5=CTF).
5A4D00	Integer	Number of players in game from your jj2-client.
5C6900	Integer	Whether you talk in teamchat or not. (0=public chat, 1=blue chat, 2=red chat)
5D012C	Integer	Whether the “chatbox” is open or not. (1/0) after that it functions as chat string length counter, meaning that if the chatstring is one character, then the value will be 2.
5D01D0	Integer	Maximal score.
5D0204	String	Current level filename.
5DB7F0	Integer	Change to 6 to restart level.
5F7CA0	Integer	Height, camera-view.
5F7D40	Integer	Width, camera-view.
5FB188	String	Server name.
5FB1C8	String	The server password.
5FCCE9	Integer	Maximal amount of allowed players in server.
5FCCEA	Boolean	Private server (1=True, 0=False).
608A00	Boolean	Running or not

1.24

Player-dependent memory addresses

The only difference with player memory addresses for 1.23 is the actual address. Add 0×23620 to the 1.23 address to get the 1.24 address. For example, the first player’s X-position in 1.24 is 0×5C850C.

Global memory addresses

Address	Type	Description
4C6928	Boolean	Playernames visible or not (F8).
4C9bE8	String	JJ2 version.
4F036C	Integer	Your playernumber (zero-based).
4F33F0	HINSTANCE	JJ2’s instance handle.
4F33FC	HWND	JJ2’s window handle.
4F341C	HMENU	JJ2’s menu handle.
54D573	String	Next level filename.
54D5B3	String	Current level music.
59E060	Boolean	Jjnowall.
5ADBC0	Integer	How long the game loop has been running (gameticks).
5ADC61	String	Chatstring.
5C7D60	Integer	Blue score.
5C7D64	Integer	Red score.
5C8184	Integer	Simulates F9.
5C8188	Integer	Game mode.
5C8320	Integer	Number of players in game from jj2 client.
5C85B4	Boolean	Unable to do another double jump or not?
5E9F20	Integer	Whether you talk in teamchat or not. (0=public chat, 1=blue chat, 2=red chat)
5F374C	Integer	Whether the “chatbox” is open or not. (1/0) after that it functions as chat string length counter, meaning that if the chatstring is one character, then the value will be 2.
5F37F0	Integer	Max score.
5F3824	String	Current level filename.
5FEE10	Integer	Set to 6 to restart level.
61E7E8	String	Server password.
620309	Integer	Max players (1-32)
62030A	Boolean	Private server (1=True, 0=False).
62C020	Boolean	Running?