diff --git a/GALLERY.md b/GALLERY.md
index c5fb77bc..a697b086 100644
--- a/GALLERY.md
+++ b/GALLERY.md
@@ -23,6 +23,7 @@ This gallery shows examples from all available datasets using their default conf
 - [group_anagrams](#group_anagrams)
 - [gsm_symbolic](#gsm_symbolic)
 - [intermediate_integration](#intermediate_integration)
+- [isomorphic_strings](#isomorphic_strings)
 - [largest_island](#largest_island)
 - [lcm](#lcm)
 - [leg_counting](#leg_counting)
@@ -41,6 +42,7 @@ This gallery shows examples from all available datasets using their default conf
 - [propositional_logic](#propositional_logic)
 - [quantum_lock](#quantum_lock)
 - [rubiks_cube](#rubiks_cube)
+- [self_reference](#self_reference)
 - [sentence_reordering](#sentence_reordering)
 - [simple_equations](#simple_equations)
 - [simple_geometry](#simple_geometry)
@@ -1072,6 +1074,99 @@ Metadata: {'integrand': '2*asin(x)', 'problem_type': 'by_parts', 'variable': 'x'
 
 ````
 
+### isomorphic_strings
+Generates Isomorphic Strings exercises with configurable difficulty
+
+Default configuration:
+```python
+max_string_length = 10
+p_solvable = 0.5
+size = 500
+seed = 42
+```
+
+Example tasks:
+````
+Example 1:
+Question: Two strings are isomorphic if the characters in one string can be replaced to get the second string.
+
+All occurrences of a character must be replaced with another character while preserving the order of characters.
+
+No two characters may map to the same character, but a character may map to itself.
+
+Example 1:
+Input: egg add
+Output: True
+Explanation: The strings s and t can be made identical by:
+    - Mapping 'e' to 'a'.
+    - Mapping 'g' to 'd'.
+
+Example 2:
+Input: foo bar
+Output: False
+Explanation:
+    - The strings cannot be made identical as 'o' needs to be mapped to both 'a' and 'r'.
+
+Return True if the following two strings are isomorphic, or False otherwise:
+cc bw
+
+Answer: False
+Metadata: {'words': ['cc', 'bw'], 'solution': False, 'solvable': False}
+
+Example 2:
+Question: Two strings are isomorphic if the characters in one string can be replaced to get the second string.
+
+All occurrences of a character must be replaced with another character while preserving the order of characters.
+
+No two characters may map to the same character, but a character may map to itself.
+
+Example 1:
+Input: egg add
+Output: True
+Explanation: The strings s and t can be made identical by:
+    - Mapping 'e' to 'a'.
+    - Mapping 'g' to 'd'.
+
+Example 2:
+Input: foo bar
+Output: False
+Explanation:
+    - The strings cannot be made identical as 'o' needs to be mapped to both 'a' and 'r'.
+
+Return True if the following two strings are isomorphic, or False otherwise:
+nai oik
+
+Answer: True
+Metadata: {'words': ['nai', 'oik'], 'solution': True, 'solvable': True}
+
+Example 3:
+Question: Two strings are isomorphic if the characters in one string can be replaced to get the second string.
+
+All occurrences of a character must be replaced with another character while preserving the order of characters.
+
+No two characters may map to the same character, but a character may map to itself.
+
+Example 1:
+Input: egg add
+Output: True
+Explanation: The strings s and t can be made identical by:
+    - Mapping 'e' to 'a'.
+    - Mapping 'g' to 'd'.
+
+Example 2:
+Input: foo bar
+Output: False
+Explanation:
+    - The strings cannot be made identical as 'o' needs to be mapped to both 'a' and 'r'.
+
+Return True if the following two strings are isomorphic, or False otherwise:
+hogtytyof kgqwfwfgh
+
+Answer: True
+Metadata: {'words': ['hogtytyof', 'kgqwfwfgh'], 'solution': True, 'solvable': True}
+
+````
+
 ### largest_island
 Generates Largest Island exercises with configurable difficulty
 
@@ -1933,6 +2028,56 @@ Metadata: {'cube_size': 3, 'scramble_steps': 3, 'scramble_moves': "U R' R'", 'ex
 
 ````
 
+### self_reference
+Generates self-referential puzzles
+
+Default configuration:
+```python
+difficulty = 5
+seed = 42
+size = 500
+```
+
+Example tasks:
+````
+Example 1:
+Question: Given the truthfulness of these statements, please tell me the number of possible solutions: 
+ - Statement 1: 'At least 1 of these 7 statements are true.'
+ - Statement 2: 'At most 3 of these 7 statements are false.'
+ - Statement 3: 'Exactly 4 of these 7 statements are true.'
+ - Statement 4: 'Exactly 3 of these 7 statements are false.'
+ - Statement 5: 'Either Statement 3 or Statement 4 is true, but not both.'
+ - Statement 6: 'The number of true statements is a prime number.'
+ - Statement 7: 'The number of false statements is a composite number.'
+
+Answer: 4
+
+Example 2:
+Question: Given the truthfulness of these statements, please tell me the number of possible solutions: 
+ - Statement 1: 'At least 4 of these 7 statements are true.'
+ - Statement 2: 'At most 5 of these 7 statements are false.'
+ - Statement 3: 'Exactly 7 of these 7 statements are true.'
+ - Statement 4: 'Exactly 1 of these 7 statements are false.'
+ - Statement 5: 'Either Statement 3 or Statement 4 is true, but not both.'
+ - Statement 6: 'The number of true statements is a prime number.'
+ - Statement 7: 'The number of false statements is a composite number.'
+
+Answer: 4
+
+Example 3:
+Question: Given the truthfulness of these statements, please tell me the number of possible solutions: 
+ - Statement 1: 'At least 2 of these 7 statements are true.'
+ - Statement 2: 'At most 5 of these 7 statements are false.'
+ - Statement 3: 'Exactly 0 of these 7 statements are true.'
+ - Statement 4: 'Exactly 3 of these 7 statements are false.'
+ - Statement 5: 'Either Statement 3 or Statement 4 is true, but not both.'
+ - Statement 6: 'The number of true statements is a prime number.'
+ - Statement 7: 'The number of false statements is a composite number.'
+
+Answer: 2
+
+````
+
 ### sentence_reordering
 Generates sentence reordering tasks from text spans
 
diff --git a/pyproject.toml b/pyproject.toml
index c3cc31b7..1cc23479 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "reasoning_gym"
-version = "0.1.3"
+version = "0.1.4"
 authors = [
   { name = "Open-Thought community", email = "andreas.koepf@xamla.com" },
 ]
diff --git a/reasoning_gym/__init__.py b/reasoning_gym/__init__.py
index 019873ff..6f18d2e7 100644
--- a/reasoning_gym/__init__.py
+++ b/reasoning_gym/__init__.py
@@ -5,7 +5,7 @@ Reasoning Gym - A library of procedural dataset generators for training reasonin
 from . import algebra, algorithmic, arithmetic, code, cognition, data, games, geometry, graphs, logic
 from .factory import create_dataset, register_dataset
 
-__version__ = "0.1.3"
+__version__ = "0.1.4"
 __all__ = [
     "algebra",
     "algorithmic",
diff --git a/reasoning_gym/logic/self_reference.py b/reasoning_gym/logic/self_reference.py
index 045fc22e..d8155b4c 100644
--- a/reasoning_gym/logic/self_reference.py
+++ b/reasoning_gym/logic/self_reference.py
@@ -3,7 +3,6 @@ from random import Random
 from typing import Dict, Optional
 
 from ..factory import ProceduralDataset, register_dataset
-from .contrib.logic_puzzle.generate import generate_puzzle
 
 
 def is_prime(n):
diff --git a/tests/test_complex_arithmetic.py b/tests/test_complex_arithmetic.py
index 0317b93e..0d369fc1 100644
--- a/tests/test_complex_arithmetic.py
+++ b/tests/test_complex_arithmetic.py
@@ -45,10 +45,6 @@ def test_complex_arithmetic_basic():
     # answer is formatted as "real + imagi"
     assert ComplexArithmeticDataset.parse_string_to_complex(item["answer"]) == complex(*item["metadata"]["result"])
 
-    with open("complex_arithmetic_dataset.txt", "w") as f:
-        for item in dataset:
-            f.write(str(item) + "\n")
-
 
 def test_complex_arithmetic_scoring():
     """Test scoring function with various answer formats and accuracies."""