diff --git a/challenges/medium/64_weight_dequantization/challenge.html b/challenges/medium/64_weight_dequantization/challenge.html
index aca2164..4ee6f3a 100644
--- a/challenges/medium/64_weight_dequantization/challenge.html
+++ b/challenges/medium/64_weight_dequantization/challenge.html
@@ -50,5 +50,5 @@ <h2>Constraints</h2>
   <li>1 &le; <code>M</code>, <code>N</code> &le; 8192</li>
   <li><code>TILE_SIZE</code> &in; {16, 32, 64, 128}</li>
 
-  <li>Performance is measured with <code>M</code> = 8,192, <code>N</code> = 8,192</li>
+  <li>Performance is measured with <code>M</code> = 8,192, <code>N</code> = 8,192, <code>TILE_SIZE</code> = 128</li>
 </ul>
diff --git a/challenges/medium/64_weight_dequantization/challenge.py b/challenges/medium/64_weight_dequantization/challenge.py
index a210661..db8db37 100644
--- a/challenges/medium/64_weight_dequantization/challenge.py
+++ b/challenges/medium/64_weight_dequantization/challenge.py
@@ -14,24 +14,19 @@ def __init__(self):
     def reference_impl(
         self, X: torch.Tensor, S: torch.Tensor, Y: torch.Tensor, M: int, N: int, TILE_SIZE: int
     ):
-        # S shape: (ceil(M/TILE_SIZE), ceil(N/TILE_SIZE))
-        # We expand S to match X's shape (M, N)
-
-        # Expand rows
-        S_expanded = S.repeat_interleave(TILE_SIZE, dim=0)
-        # Crop if M is not a multiple of TILE_SIZE
-        if S_expanded.shape[0] > M:
-            S_expanded = S_expanded[:M, :]
+        s_rows = (M + TILE_SIZE - 1) // TILE_SIZE
+        s_cols = (N + TILE_SIZE - 1) // TILE_SIZE
+        assert X.shape == (M, N)
+        assert S.shape == (s_rows, s_cols)
+        assert Y.shape == (M, N)
+        assert X.dtype == torch.float32
+        assert S.dtype == torch.float32
+        assert Y.dtype == torch.float32
 
-        # Expand cols
-        S_expanded = S_expanded.repeat_interleave(TILE_SIZE, dim=1)
-        # Crop if N is not a multiple of TILE_SIZE
-        if S_expanded.shape[1] > N:
-            S_expanded = S_expanded[:, :N]
+        S_expanded = S.repeat_interleave(TILE_SIZE, dim=0)[:M, :]
+        S_expanded = S_expanded.repeat_interleave(TILE_SIZE, dim=1)[:, :N]
 
-        # Perform element-wise multiplication
-        # Ensure Y is updated in-place
-        Y.copy_(X.to(Y.dtype) * S_expanded.to(Y.dtype))
+        Y.copy_(X * S_expanded)
 
     def get_solve_signature(self) -> Dict[str, tuple]:
         return {
@@ -65,30 +60,48 @@ def generate_example_test(self) -> Dict[str, Any]:
     def generate_functional_test(self) -> List[Dict[str, Any]]:
         tests = []
 
-        # Case 1: Perfect Multiple
-        M, N = 256, 256
-        TILE_SIZE = 128
-        tests.append(
-            {
-                "name": "perfect_multiple",
-                "X": torch.randn(M, N, device="cuda", dtype=torch.float32),
-                "S": torch.randn(2, 2, device="cuda", dtype=torch.float32),
-                "Y": torch.zeros(M, N, device="cuda", dtype=torch.float32),
-                "M": M,
-                "N": N,
-                "TILE_SIZE": TILE_SIZE,
-            }
-        )
-
-        # Case 2: Odd sizes (padding needed)
-        M, N = 130, 200
-        TILE_SIZE = 128
-        # Rows: ceil(130/128) = 2. Cols: ceil(200/128) = 2.
+        test_configs = [
+            # Edge cases - small sizes
+            (1, 1, 16),
+            (2, 3, 16),
+            (4, 4, 16),
+            # Power-of-2 sizes
+            (64, 64, 32),
+            (128, 128, 64),
+            (256, 256, 128),
+            (512, 512, 128),
+            # Non-power-of-2 sizes (padding needed)
+            (30, 50, 16),
+            (100, 100, 32),
+            (130, 200, 128),
+            (255, 255, 64),
+            # Realistic sizes
+            (1024, 1024, 128),
+            (2048, 4096, 128),
+        ]
+
+        for M, N, TILE_SIZE in test_configs:
+            s_rows = (M + TILE_SIZE - 1) // TILE_SIZE
+            s_cols = (N + TILE_SIZE - 1) // TILE_SIZE
+            tests.append(
+                {
+                    "X": torch.randn(M, N, device="cuda", dtype=torch.float32),
+                    "S": torch.randn(s_rows, s_cols, device="cuda", dtype=torch.float32),
+                    "Y": torch.zeros(M, N, device="cuda", dtype=torch.float32),
+                    "M": M,
+                    "N": N,
+                    "TILE_SIZE": TILE_SIZE,
+                }
+            )
+
+        # Zero input
+        M, N, TILE_SIZE = 64, 64, 32
+        s_rows = (M + TILE_SIZE - 1) // TILE_SIZE
+        s_cols = (N + TILE_SIZE - 1) // TILE_SIZE
         tests.append(
             {
-                "name": "irregular_size",
-                "X": torch.randn(M, N, device="cuda", dtype=torch.float32),
-                "S": torch.randn(2, 2, device="cuda", dtype=torch.float32),
+                "X": torch.zeros(M, N, device="cuda", dtype=torch.float32),
+                "S": torch.randn(s_rows, s_cols, device="cuda", dtype=torch.float32),
                 "Y": torch.zeros(M, N, device="cuda", dtype=torch.float32),
                 "M": M,
                 "N": N,
@@ -96,14 +109,14 @@ def generate_functional_test(self) -> List[Dict[str, Any]]:
             }
         )
 
-        # Case 3: Small Tile Size
-        M, N = 64, 64
-        TILE_SIZE = 32
+        # Negative values
+        M, N, TILE_SIZE = 128, 128, 64
+        s_rows = (M + TILE_SIZE - 1) // TILE_SIZE
+        s_cols = (N + TILE_SIZE - 1) // TILE_SIZE
         tests.append(
             {
-                "name": "small_tiles",
-                "X": torch.randn(M, N, device="cuda", dtype=torch.float32),
-                "S": torch.randn(2, 2, device="cuda", dtype=torch.float32),
+                "X": torch.randn(M, N, device="cuda", dtype=torch.float32).sub_(0.5),
+                "S": torch.randn(s_rows, s_cols, device="cuda", dtype=torch.float32).sub_(0.5),
                 "Y": torch.zeros(M, N, device="cuda", dtype=torch.float32),
                 "M": M,
                 "N": N,
diff --git a/scripts/run_challenge.py b/scripts/run_challenge.py
index e39f8ea..31dc2fc 100644
--- a/scripts/run_challenge.py
+++ b/scripts/run_challenge.py
@@ -64,7 +64,7 @@ def submit_solution(
                 "gpu": gpu,
                 "mode": "accelerated",
                 "public": public,
-                "challenge_id": challenge_id,
+                "challengeId": challenge_id,
             },
         }
         ws.send(json.dumps(submission))