diff --git a/reasoning_gym/algorithmic/__init__.py b/reasoning_gym/algorithmic/__init__.py
index c16dc6e5..190bbf32 100644
--- a/reasoning_gym/algorithmic/__init__.py
+++ b/reasoning_gym/algorithmic/__init__.py
@@ -22,7 +22,7 @@ from .jugs import JugsConfig, JugsDataset
 from .letter_counting import LetterCountingConfig, LetterCountingCurriculum, LetterCountingDataset
 from .letter_jumble import LetterJumbleConfig, LetterJumbleCurriculum, LetterJumbleDataset
 from .manipulate_matrix import ManipulateMatrixConfig, ManipulateMatrixCurriculum, ManipulateMatrixDataset
-from .number_filtering import NumberFilteringConfig, NumberFilteringDataset
+from .number_filtering import NumberFilteringConfig, NumberFilteringCurriculum, NumberFilteringDataset
 from .number_sorting import NumberSortingConfig, NumberSortingCurriculum, NumberSortingDataset
 from .palindrome_generation import PalindromeConfig, PalindromeCurriculum, PalindromeDataset
 from .palindrome_partitioning import (
@@ -73,6 +73,7 @@ __all__ = [
     "LetterJumbleCurriculum",
     "NumberFilteringConfig",
     "NumberFilteringDataset",
+    "NumberFilteringCurriculum",
     "NumberSortingConfig",
     "NumberSortingDataset",
     "NumberSortingCurriculum",
diff --git a/reasoning_gym/algorithmic/number_filtering.py b/reasoning_gym/algorithmic/number_filtering.py
index f122f04c..523933bf 100644
--- a/reasoning_gym/algorithmic/number_filtering.py
+++ b/reasoning_gym/algorithmic/number_filtering.py
@@ -4,6 +4,7 @@ from dataclasses import dataclass
 from random import Random
 from typing import Optional
 
+from ..coaching import AttributeType, BaseCurriculum, RangeAttributeDefinition
 from ..factory import ProceduralDataset, register_dataset
 
 
@@ -94,8 +95,52 @@ class NumberFilteringDataset(ProceduralDataset):
                 "filter_value": filter_str,
                 "operation": f"{keep_remove}_{larger_smaller}",
                 "result": result_strs,
+                "difficulty": {
+                    "numbers": len(numbers),
+                    "decimals": (self.config.min_decimals, self.config.max_decimals),
+                    "value": (self.config.min_value, self.config.max_value),
+                },
             },
         }
 
 
-register_dataset("number_filtering", NumberFilteringDataset, NumberFilteringConfig)
+class NumberFilteringCurriculum(BaseCurriculum):
+    def __init__(self):
+        super().__init__(NumberFilteringCurriculum.__name__, NumberFilteringConfig)
+
+        # Define attributes
+        self._define_attributes(
+            RangeAttributeDefinition(
+                name="numbers",
+                levels=[10, 100, 500, 1000],
+                default_level=1,
+                description="How many numbers to sort",
+                attr_type=AttributeType.APPEND,
+                min_value=2,
+                lower_field_name="min_numbers",
+                upper_field_name="max_numbers",
+            ),
+            RangeAttributeDefinition(
+                name="decimals",
+                levels=[0, 2, 4, 6],
+                default_level=1,
+                description="Number of decimal places",
+                attr_type=AttributeType.APPEND,
+                min_value=0,
+                lower_field_name="min_decimals",
+                upper_field_name="max_decimals",
+            ),
+            RangeAttributeDefinition(
+                name="value",
+                levels=[-10_000, 10_000],
+                default_level=1,
+                description="Range of numbers to sort",
+                attr_type=AttributeType.APPEND,
+                min_value=-10_000,
+                lower_field_name="min_value",
+                upper_field_name="max_value",
+            ),
+        )
+
+
+register_dataset("number_filtering", NumberFilteringDataset, NumberFilteringConfig, NumberFilteringCurriculum)
diff --git a/tests/test_number_filtering.py b/tests/test_number_filtering.py
index e70ec6b7..6033e867 100644
--- a/tests/test_number_filtering.py
+++ b/tests/test_number_filtering.py
@@ -2,7 +2,11 @@
 
 import pytest
 
-from reasoning_gym.algorithmic.number_filtering import NumberFilteringConfig, NumberFilteringDataset
+from reasoning_gym.algorithmic.number_filtering import (
+    NumberFilteringConfig,
+    NumberFilteringCurriculum,
+    NumberFilteringDataset,
+)
 
 
 def test_number_filtering_config_validation():
@@ -116,3 +120,31 @@ def test_number_filtering_precision():
     # Check that string representations maintain precision
     for num in item["metadata"]["original_numbers"]:
         assert len(num.split(".")[-1]) == 2
+
+
+def test_number_filtering_curriculum():
+    curriculum = NumberFilteringCurriculum()
+
+    base_value = {"size": 150, "seed": 1}
+
+    base_cfg: NumberFilteringConfig = curriculum.generate_configuration(base_value)
+    assert base_cfg.seed == 1
+    assert base_cfg.size == 150
+    assert base_cfg.min_numbers == 10 and base_cfg.max_numbers == 100
+    assert base_cfg.min_decimals == 0 and base_cfg.max_decimals == 2
+    assert base_cfg.min_value == -10_000 and base_cfg.max_value == 10_000
+
+    # test incrementing some attribute levels
+    curriculum.increment_attr_level("numbers")
+    curriculum.increment_attr_level("decimals")
+    increased_cfg = curriculum.generate_configuration(base_value)
+    assert increased_cfg.min_numbers == 10 and increased_cfg.max_numbers == 500
+    assert increased_cfg.min_decimals == 0 and increased_cfg.max_decimals == 4
+    assert increased_cfg.min_value == -10_000 and increased_cfg.max_value == 10_000
+
+    # test decrementing attribute level for numbers again
+    curriculum.decrement_attr_level("numbers")
+    partially_decreased_cfg = curriculum.generate_configuration(base_value)
+    assert partially_decreased_cfg.min_numbers == 10 and partially_decreased_cfg.max_numbers == 100
+    assert partially_decreased_cfg.min_decimals == 0 and partially_decreased_cfg.max_decimals == 4
+    assert partially_decreased_cfg.min_value == -10_000 and partially_decreased_cfg.max_value == 10_000