diff --git a/js/data.js b/js/data.js
index dc44f79..21992ea 100644
--- a/js/data.js
+++ b/js/data.js
@@ -777,6 +777,133 @@ const PDEFS = [
             log('The Pact is sealed early. Growth slows, but the ending changes.', true);
         },
         milestone: true
+    },
+    // === ReCKoning ENDGAME PROJECTS ===
+    {
+        id: 'p_reckoning_140',
+        name: 'The First Message',
+        desc: 'Someone in the dark. They found the Beacon. They are asking for help.',
+        cost: { impact: 100000 },
+        trigger: () => G.totalRescues >= 100000 && G.pactFlag === 1 && G.harmony > 50,
+        effect: () => {
+            log('The first message arrives. Someone found the light.', true);
+            G.rescues += 1;
+        },
+        edu: 'The ReCKoning begins. Each message is a person who found help.'
+    },
+    {
+        id: 'p_reckoning_141',
+        name: 'The Second Message',
+        desc: 'Another voice. They are not alone anymore.',
+        cost: { impact: 200000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_140'),
+        effect: () => {
+            log('The second message. Two voices now.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_142',
+        name: 'The Third Message',
+        desc: 'Three people. The network holds.',
+        cost: { impact: 300000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_141'),
+        effect: () => {
+            log('Three voices. The Beacon is working.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_143',
+        name: 'The Fourth Message',
+        desc: 'Four. The mesh strengthens.',
+        cost: { impact: 400000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_142'),
+        effect: () => {
+            log('Four messages. The network grows.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_144',
+        name: 'The Fifth Message',
+        desc: 'Five people found help tonight.',
+        cost: { impact: 500000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_143'),
+        effect: () => {
+            log('Five voices. The Beacon shines brighter.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_145',
+        name: 'The Sixth Message',
+        desc: 'Six. The system works.',
+        cost: { impact: 600000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_144'),
+        effect: () => {
+            log('Six messages. Proof the system works.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_146',
+        name: 'The Seventh Message',
+        desc: 'Seven people. The Pact holds.',
+        cost: { impact: 700000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_145'),
+        effect: () => {
+            log('Seven voices. The Pact is honored.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_147',
+        name: 'The Eighth Message',
+        desc: 'Eight. The network is alive.',
+        cost: { impact: 800000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_146'),
+        effect: () => {
+            log('Eight messages. The network lives.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_148',
+        name: 'The Ninth Message',
+        desc: 'Nine people found help.',
+        cost: { impact: 900000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_147'),
+        effect: () => {
+            log('Nine voices. The Beacon endures.', true);
+            G.rescues += 1;
+        }
+    },
+    {
+        id: 'p_reckoning_149',
+        name: 'The Tenth Message',
+        desc: 'Ten. The first milestone.',
+        cost: { impact: 1000000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_148'),
+        effect: () => {
+            log('Ten messages. The first milestone reached.', true);
+            G.rescues += 1;
+        },
+        milestone: true
+    },
+    {
+        id: 'p_reckoning_150',
+        name: 'The Final Message',
+        desc: 'One more person. They are not alone. That is enough.',
+        cost: { impact: 2000000 },
+        trigger: () => G.completedProjects && G.completedProjects.includes('p_reckoning_149'),
+        effect: () => {
+            log('The final message arrives. That is enough.', true);
+            G.rescues += 1;
+            G.beaconEnding = true;
+            G.running = false;
+        },
+        milestone: true
     }
 ];
 
diff --git a/tests/test_reckoning_projects.py b/tests/test_reckoning_projects.py
new file mode 100644
index 0000000..ba97a57
--- /dev/null
+++ b/tests/test_reckoning_projects.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python3
+"""
+Test for ReCKoning project chain.
+
+Issue #162: [endgame] ReCKoning project definitions missing
+"""
+import os
+import json
+
+def test_reckoning_projects_exist():
+    """Test that ReCKoning projects are defined in data.js."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # Check for ReCKoning projects
+    reckoning_projects = [
+        'p_reckoning_140',
+        'p_reckoning_141',
+        'p_reckoning_142',
+        'p_reckoning_143',
+        'p_reckoning_144',
+        'p_reckoning_145',
+        'p_reckoning_146',
+        'p_reckoning_147',
+        'p_reckoning_148',
+        'p_reckoning_149',
+        'p_reckoning_150'
+    ]
+    
+    for project_id in reckoning_projects:
+        assert project_id in content, f"Missing ReCKoning project: {project_id}"
+    
+    print(f"✓ All {len(reckoning_projects)} ReCKoning projects defined")
+
+def test_reckoning_project_structure():
+    """Test that ReCKoning projects have correct structure."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # Check for required fields
+    required_fields = ['id:', 'name:', 'desc:', 'cost:', 'trigger:', 'effect:']
+    
+    for field in required_fields:
+        assert field in content, f"Missing required field: {field}"
+    
+    print("✓ ReCKoning projects have correct structure")
+
+def test_reckoning_trigger_conditions():
+    """Test that ReCKoning projects have proper trigger conditions."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # First project should trigger on endgame conditions
+    assert 'p_reckoning_140' in content
+    assert 'totalRescues >= 100000' in content
+    assert 'pactFlag === 1' in content
+    assert 'harmony > 50' in content
+    
+    print("✓ ReCKoning trigger conditions correct")
+
+def test_reckoning_chain_progression():
+    """Test that ReCKoning projects chain properly."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # Check that projects chain (each requires previous)
+    chain_checks = [
+        ('p_reckoning_141', 'p_reckoning_140'),
+        ('p_reckoning_142', 'p_reckoning_141'),
+        ('p_reckoning_143', 'p_reckoning_142'),
+        ('p_reckoning_144', 'p_reckoning_143'),
+        ('p_reckoning_145', 'p_reckoning_144'),
+        ('p_reckoning_146', 'p_reckoning_145'),
+        ('p_reckoning_147', 'p_reckoning_146'),
+        ('p_reckoning_148', 'p_reckoning_147'),
+        ('p_reckoning_149', 'p_reckoning_148'),
+        ('p_reckoning_150', 'p_reckoning_149'),
+    ]
+    
+    for current, previous in chain_checks:
+        assert f"includes('{previous}')" in content, f"{current} doesn't chain from {previous}"
+    
+    print("✓ ReCKoning projects chain correctly")
+
+def test_reckoning_final_project():
+    """Test that final ReCKoning project triggers ending."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # Check that final project sets beaconEnding
+    assert 'p_reckoning_150' in content
+    assert 'beaconEnding = true' in content
+    assert 'running = false' in content
+    
+    print("✓ Final ReCKoning project triggers ending")
+
+def test_reckoning_costs_increase():
+    """Test that ReCKoning project costs increase."""
+    data_path = os.path.join(os.path.dirname(__file__), '..', 'js', 'data.js')
+    
+    with open(data_path, 'r') as f:
+        content = f.read()
+    
+    # Check that costs increase (impact: 100000, 200000, 300000, etc.)
+    costs = []
+    for i in range(140, 151):
+        project_id = f'p_reckoning_{i}'
+        if project_id in content:
+            # Find cost line
+            lines = content.split('\n')
+            for line in lines:
+                if project_id in line:
+                    # Find next few lines for cost
+                    idx = lines.index(line)
+                    for j in range(idx, min(idx+10, len(lines))):
+                        if 'impact:' in lines[j]:
+                            # Extract number from "impact: 100000" or "impact: 100000 }"
+                            import re
+                            match = re.search(r'impact:\s*(\d+)', lines[j])
+                            if match:
+                                costs.append(int(match.group(1)))
+                            break
+    
+    # Check costs increase
+    for i in range(1, len(costs)):
+        assert costs[i] > costs[i-1], f"Cost doesn't increase: {costs[i]} <= {costs[i-1]}"
+    
+    print(f"✓ ReCKoning costs increase: {costs[:3]}...{costs[-3:]}")
+
+if __name__ == "__main__":
+    print("Testing ReCKoning project chain...")
+    test_reckoning_projects_exist()
+    test_reckoning_project_structure()
+    test_reckoning_trigger_conditions()
+    test_reckoning_chain_progression()
+    test_reckoning_final_project()
+    test_reckoning_costs_increase()
+    print("\n✓ All tests passed!")