3L

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3L is an esolang by User:ChuckEsoteric08 which is a simplification of 2DChanger and with the name taken from 2L but refers to actual number of instructions in both itself and 2L

Specification

The program is on a two-dimensional grid with instruction pointer in top left corner and moving right. It uses binary tape infinite in both directions (unlike 2DChanger which uses right-infinite). It has three commands:

• } - flip current cell and move tape pointer right
• + - move tape pointer left. If current cell is 1, turn clockwise, else turn counter-clockwise
• Everything else is a NOP but it is very important and thus counted as a seperate instruction

When running program backwards each command can be reversed, proving that it is reversible:

• } - move tape pointer left and flip current cell
• + - if current cell is 1 turn counter-clockwise, else turn clockwise. Regardless of the value move tape pointer right
• NOP is it's own reverse

Examples

Simple Infinite loop

}++
 ++

It flips current cell and infinitely moves tape pointer to the left

Computational class

3L is Turing-complete as it can simulate Reversible Brainfuck with binary tape. Here is the translation method, which translates each instruction into horizontal pattern and uses 8 cells for each simulated RBF bit:

• Program starts with:

}}}}+    
         
   + }}}}
   ++

• + becomes:

         ++++
         +  +
}}}} }}}} ++ 
         +  +
         ++++

• > becomes:

         ++++         
         +  +         
}}}} }}}} ++ }}}} }}}}
         +  +         
         ++++         

• < becomes:

  ++++
  +  +
   ++
  +  +
  ++++

• [abc] becomes:

         ++++         ++++             ++++         ++++        
         +  +         +  +             +  +         +  +
}}}} }}}} ++ }}}} }}}} ++ abc }}}} }}}} ++ }}}} }}}} ++ 
         +  +                          +  +             
         ++++                          ++++             
                      +                                +
                      ++                              ++
                                                    + +
                                                    ++
                        +                             +

For each nesting depth gap between fifth and sixth lines should increased by 5.