UBX

Not to be confused with Bx because they're completely different esolangs although invented by the same author.

UBX (Ultimate Brainfuck eXtension) is an esolang invented by User:None1. It is brainfuck but equipped with almost all the extensions mentioned in Brainfuck extensions (as of 2026/1/17 13:00 UTC).

Memory

There are two 2-dimensional tapes. Each tape is unbounded on 2 sides, and cells contain unbounded unsigned integers. Each tape has two pointers, one with ID 0 and the other with ID 1. It doesn't matter which pointer is initially used.

There's also an unbounded unsigned accumulator.

Addresses are defined like this:

0 1 5 6 ...
2 4 7 13 ...
3 8 12 ...
9 11 ...
10 ...

The first line stores the program's source code (as C-style string) while ther cells are zeros.

Memory is persistent, which means that after each command, a new snapshot of the memory is created. The ID of the initial memory is 0. The ID of a new snapshot is the ID of the last snapshot plus 1.

Programs

Programs are 2-dimensional.

Commands

Besides all the commands in brainfuck, UBX has these commands:

Caption text

Command	Meaning
*	Jump to the current cell-th command (0-indexed).
A,S,M,D,R	Add/subtract/multiply/floor divide/modulus the accumulator by current cell.
~	Swap accumulator and current cell.
«,»	Left/right shift the accumulator by current cell bits.
&,^,|	Bitwise and/or/xor the accumulator by current cell.
n	Bitwise invert current cell.
c	Copy current cell to accumulator (paste can be done using ~ command)
C	Clear current cell
u/U	Push accumulator into stack/queue
o/O	Pop stack/queue and store the popped value in accumulator
B/b	Break/continue current loop
s	Self-interpret the C-style string starting from current cell. Execution goes back to the original program after the subprogram is finished.
f"filename"	Redirect I/O to file path filename
F	Redirect I/O back to standard I/O
%	Beep (440 Hz, 1s)
:,;	Read/Write current cell as integer
$&,$^,$|	Logical and/or/xor the accumulator by current cell.
$~	Logical not the accumulator by current cell.
?	Switch to the other pointer on the same tape.
？	Switch to the pointer with the same ID as the current one, but which is located on the other tape.
↺	Rotate the IP 90° counter-clockwise.
↻	Rotate the IP 90° clockwise.
T	Spawns a thread which executes the current cell-th (0-indexed) line of code.
N"a.b.c.d:e"	Redirects I/O to a connection to given IP address and port (You can use F to switch back to standard I/O as well).
ñ	NOP
h or null character or EOF	Halt
r	Let p be the pointer, set the accumulator to *(p+*p).
w	Let p be the pointer, set *(p+*p) to the accmulator.
t	Toggle step trace.
ş	Read a C-style string starting from current pointer and each character is on the right of the previous one.
ü	Move the pointer to the up
v	Move the pointer to the down
₽	Print a C-style string starting from current pointer and each character is on the right of the previous one.
Ü	Time-travel to snapshot whose ID is equal to the current cell value.
💤	Sleep for current cell milliseconds (Pauses all threads).

Examples

Cheating Quine

₽