diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index e8abc71dd..5ed7840c5 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -3028,6 +3028,12 @@ class ConstVisitor final : public VNVisitor {
 
     void visit(AstArraySel* nodep) override {
         iterateAndNextNull(nodep->bitp());
+        // Multi-dimensional param array access (fromp is a chain of ArraySels):
+        // delegate to V3Simulate to natively handles InitArray chains
+        if (m_required && VN_IS(nodep->fromp(), ArraySel)) {
+            replaceWithSimulation(nodep);
+            return;
+        }
         if (VN_IS(nodep->bitp(), Const)
             && VN_IS(nodep->fromp(), VarRef)
             // Need to make sure it's an array object so don't mis-allow a constant (bug509.)
diff --git a/test_regress/t/t_param_array2dim.py b/test_regress/t/t_param_array2dim.py
new file mode 100755
index 000000000..8a938befd
--- /dev/null
+++ b/test_regress/t/t_param_array2dim.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of either the GNU Lesser General Public License Version 3
+# or the Perl Artistic License Version 2.0.
+# SPDX-FileCopyrightText: 2026 Wilson Snyder
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile()
+
+test.execute()
+
+test.passes()
diff --git a/test_regress/t/t_param_array2dim.v b/test_regress/t/t_param_array2dim.v
new file mode 100644
index 000000000..00762ae62
--- /dev/null
+++ b/test_regress/t/t_param_array2dim.v
@@ -0,0 +1,43 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain.
+// SPDX-FileCopyrightText: 2020 Dustin Richmond
+// SPDX-License-Identifier: CC0-1.0
+
+// Test: 2D array parameter passed to sub-modules via generate loops
+
+module baz
+  #(
+    parameter integer type_p = '0
+    )
+   ();
+
+endmodule
+
+module t
+  #(
+    parameter integer n_x_p = 4
+    ,parameter integer n_y_p = 4
+    ,parameter integer twodim_p [0:n_y_p-1][0:n_x_p-1] = '{n_y_p{'{n_x_p{0}}}}
+    )
+   ();
+
+   genvar r, c;
+
+   for (r = 0; r < n_y_p; r = r+1)
+     begin: y
+        for (c = 0; c < n_x_p; c=c+1)
+          begin: x
+        baz
+            #(.type_p(twodim_p[r][c]))
+        baz_i
+            ();
+          end
+     end
+
+   initial begin
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule
diff --git a/test_regress/t/t_param_pattern_2d_init.py b/test_regress/t/t_param_pattern_2d_init.py
new file mode 100755
index 000000000..8a938befd
--- /dev/null
+++ b/test_regress/t/t_param_pattern_2d_init.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of either the GNU Lesser General Public License Version 3
+# or the Perl Artistic License Version 2.0.
+# SPDX-FileCopyrightText: 2026 Wilson Snyder
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile()
+
+test.execute()
+
+test.passes()
diff --git a/test_regress/t/t_param_pattern_2d_init.v b/test_regress/t/t_param_pattern_2d_init.v
new file mode 100644
index 000000000..92857c82e
--- /dev/null
+++ b/test_regress/t/t_param_pattern_2d_init.v
@@ -0,0 +1,41 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain.
+// SPDX-FileCopyrightText: 2026 Greg Davill
+// SPDX-License-Identifier: CC0-1.0
+
+`define stop $stop
+`define checkh(gotv,
+               expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d:  got='h%x exp='h%x\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
+
+module t (  /*AUTOARG*/);
+
+  // Test: 2D array localparam with pattern initialization
+  localparam logic [31:0] MATRIX[2][3] = '{'{32'hA0, 32'hA1, 32'hA2}, '{32'hB0, 32'hB1, 32'hB2}};
+
+  // Deriving a localparam from a 2D array element
+  localparam logic [31:0] DERIVED_A0 = MATRIX[0][0];
+  localparam logic [31:0] DERIVED_B2 = MATRIX[1][2];
+
+  // Use derived values as sub-module parameters to force elaboration-time resolution
+  sub #(.VAL(MATRIX[0][1])) u_sub ();
+
+  initial begin
+    `checkh(DERIVED_A0, 32'hA0);
+    `checkh(DERIVED_B2, 32'hB2);
+    $write("*-* All Finished *-*\n");
+    $finish;
+  end
+
+endmodule
+
+module sub #(
+    parameter logic [31:0] VAL = 0
+) ();
+  initial begin
+    if (VAL !== 32'hA1) begin
+      $display("%%Error: sub VAL='h%x expected 'hA1", VAL);
+      $stop;
+    end
+  end
+endmodule
diff --git a/test_regress/t/t_param_pattern_3d_init.py b/test_regress/t/t_param_pattern_3d_init.py
new file mode 100755
index 000000000..8a938befd
--- /dev/null
+++ b/test_regress/t/t_param_pattern_3d_init.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of either the GNU Lesser General Public License Version 3
+# or the Perl Artistic License Version 2.0.
+# SPDX-FileCopyrightText: 2026 Wilson Snyder
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile()
+
+test.execute()
+
+test.passes()
diff --git a/test_regress/t/t_param_pattern_3d_init.v b/test_regress/t/t_param_pattern_3d_init.v
new file mode 100644
index 000000000..ca9a3f801
--- /dev/null
+++ b/test_regress/t/t_param_pattern_3d_init.v
@@ -0,0 +1,31 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain.
+// SPDX-FileCopyrightText: 2026 Greg Davill
+// SPDX-License-Identifier: CC0-1.0
+
+`define stop $stop
+`define checkh(gotv,
+               expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d:  got='h%x exp='h%x\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
+
+module t (  /*AUTOARG*/);
+
+  // Test: 3D array localparam with pattern initialization
+  localparam logic [31:0] CUBE[2][2][2] = '{
+      '{'{32'h00, 32'h01}, '{32'h10, 32'h11}},
+      '{'{32'h20, 32'h21}, '{32'h30, 32'h31}}
+  };
+
+  // Deriving a localparam from a 3D array element
+  localparam logic [31:0] CUBE_VAL = CUBE[1][0][1];
+
+  initial begin
+    `checkh(CUBE_VAL, 32'h21);
+    `checkh(CUBE[0][0][0], 32'h00);
+    `checkh(CUBE[0][1][1], 32'h11);
+    `checkh(CUBE[1][1][0], 32'h30);
+    $write("*-* All Finished *-*\n");
+    $finish;
+  end
+
+endmodule