diff --git a/js/algorithms.js b/js/algorithms.js
index 6d430e8..9deed72 100644
--- a/js/algorithms.js
+++ b/js/algorithms.js
@@ -30,9 +30,13 @@ export function trace_floor_circuit(level, start_cell, start_edge, on_wire, on_d
             else if (terrain.type.wire_propagation_mode === 'none') {
                 // The wires in this tile never connect to each other
             }
-            else if (terrain.wire_directions === 0x0f && terrain.type.wire_propagation_mode !== 'all') {
+            else if (terrain.type.wire_propagation_mode === 'cross' ||
+                (terrain.wire_directions === 0x0f && terrain.type.wire_propagation_mode !== 'all'))
+            {
                 // This is a cross pattern, so only opposite edges connect
-                connections |= edgeinfo.opposite_bit;
+                if (terrain.wire_directions & edgeinfo.opposite_bit) {
+                    connections |= edgeinfo.opposite_bit;
+                }
             }
             else {
                 // Everything connects
diff --git a/js/tiletypes.js b/js/tiletypes.js
index f51b66d..6706d5e 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -1585,6 +1585,7 @@ const TILE_TYPES = {
     button_black: {
         draw_layer: DRAW_LAYERS.terrain,
         is_power_source: true,
+        wire_propagation_mode: 'cross',
         get_emitting_edges(me, level) {
             // We emit current as long as there's NOT an actor fully on us
             if (! me.cell.some(tile => tile.type.is_actor && tile.movement_cooldown === 0)) {