diff --git a/reasoning_gym/algorithmic/__init__.py b/reasoning_gym/algorithmic/__init__.py
index 5fc1df84..876ae8c6 100644
--- a/reasoning_gym/algorithmic/__init__.py
+++ b/reasoning_gym/algorithmic/__init__.py
@@ -38,7 +38,7 @@ from .sentence_reordering import SentenceReorderingConfig, SentenceReorderingDat
 from .spell_backward import SpellBackwardConfig, SpellBackwardDataset
 from .spiral_matrix import SpiralMatrixConfig, SpiralMatrixCurriculum, SpiralMatrixDataset
 from .string_insertion import StringInsertionConfig, StringInsertionCurriculum, StringInsertionDataset
-from .string_manipulation import StringManipulationConfig, StringManipulationDataset
+from .string_manipulation import StringManipulationConfig, StringManipulationCurriculum, StringManipulationDataset
 from .string_splitting import StringSplittingConfig, StringSplittingDataset
 from .string_synthesis import StringSynthesisConfig, StringSynthesisDataset
 from .word_ladder import WordLadderConfig, WordLadderDataset
diff --git a/reasoning_gym/algorithmic/string_manipulation.py b/reasoning_gym/algorithmic/string_manipulation.py
index 434a241e..92125f84 100644
--- a/reasoning_gym/algorithmic/string_manipulation.py
+++ b/reasoning_gym/algorithmic/string_manipulation.py
@@ -7,6 +7,7 @@ from dataclasses import dataclass
 from random import Random
 from typing import Optional
 
+from ..coaching import AttributeType, BaseCurriculum, RangeAttributeDefinition
 from ..factory import ProceduralDataset, register_dataset
 
 QUESTION_TEMPLATE = """Your job is to repeatedly transform a string according to a set of rules until no further transformations can be performed, or a state is repeated.
@@ -42,6 +43,7 @@ class StringManipulationConfig:
         assert self.min_string_length <= self.max_string_length, "Minimum string length should be less than maximum"
         assert 3 <= self.min_num_rules, "Minimum number of rules should be at least 3"
         assert self.min_num_rules <= self.max_num_rules, "Minimum number of rules should be less than maximum"
+        assert self.max_num_rules <= 20, "Maximum number of rules should be at most 20"
 
 
 class StringManipulationDataset(ProceduralDataset):
@@ -181,8 +183,43 @@ class StringManipulationDataset(ProceduralDataset):
                 "solution": answer,
                 "states": states,
                 "selected_rules": [rule for rule, _ in selected_rules],
+                "difficulty": {
+                    "string_length": string_length,
+                    "num_rules": num_rules,
+                },
             },
         }
 
 
-register_dataset("string_manipulation", StringManipulationDataset, StringManipulationConfig)
+class StringManipulationCurriculum(BaseCurriculum):
+    def __init__(self):
+        super().__init__(StringManipulationCurriculum.__name__, StringManipulationConfig)
+
+        # Define attributes
+        self._define_attributes(
+            RangeAttributeDefinition(
+                name="string_length",
+                levels=[10, 50, 100, 500],
+                default_level=0,
+                description="Length of the string",
+                attr_type=AttributeType.APPEND,
+                min_value=1,
+                lower_field_name="min_string_length",
+                upper_field_name="max_string_length",
+            ),
+            RangeAttributeDefinition(
+                name="num_rules",
+                levels=[5, 10, 15, 20],
+                default_level=0,
+                description="Number of rules to apply",
+                attr_type=AttributeType.APPEND,
+                min_value=1,
+                lower_field_name="min_num_rules",
+                upper_field_name="max_num_rules",
+            ),
+        )
+
+
+register_dataset(
+    "string_manipulation", StringManipulationDataset, StringManipulationConfig, StringManipulationCurriculum
+)
diff --git a/tests/test_string_manipulation.py b/tests/test_string_manipulation.py
index f62a7acd..a2831744 100644
--- a/tests/test_string_manipulation.py
+++ b/tests/test_string_manipulation.py
@@ -2,7 +2,11 @@
 
 import pytest
 
-from reasoning_gym.algorithmic.string_manipulation import StringManipulationConfig, StringManipulationDataset
+from reasoning_gym.algorithmic.string_manipulation import (
+    StringManipulationConfig,
+    StringManipulationCurriculum,
+    StringManipulationDataset,
+)
 
 
 def test_string_manipulation_config_validation():
@@ -255,3 +259,28 @@ def test_string_manipulation_answer():
         )
     ]
     assert dataset._get_all_transforms("acab", rules)[-1] == "zzab"
+
+
+def test_string_manipulation_curriculum():
+    curriculum = StringManipulationCurriculum()
+
+    base_value = {"size": 150, "seed": 1}
+
+    base_cfg: StringManipulationConfig = curriculum.generate_configuration(base_value)
+    assert base_cfg.seed == 1
+    assert base_cfg.size == 150
+    assert base_cfg.min_string_length == 10 and base_cfg.max_string_length == 10
+    assert base_cfg.min_num_rules == 5 and base_cfg.max_num_rules == 5
+
+    # test incrementing attribute levels
+    curriculum.increment_attr_level("string_length")
+    curriculum.increment_attr_level("num_rules")
+    increased_cfg = curriculum.generate_configuration(base_value)
+    assert increased_cfg.min_string_length == 10 and increased_cfg.max_string_length == 50
+    assert increased_cfg.min_num_rules == 5 and increased_cfg.max_num_rules == 10
+
+    # test decrementing attribute level for string_length again
+    curriculum.decrement_attr_level("string_length")
+    partially_decreased_cfg = curriculum.generate_configuration(base_value)
+    assert partially_decreased_cfg.min_string_length == 10 and partially_decreased_cfg.max_string_length == 10
+    assert partially_decreased_cfg.min_num_rules == 5 and partially_decreased_cfg.max_num_rules == 10