diff --git a/js/game.js b/js/game.js
index 0d7ddfa..7aa515c 100644
--- a/js/game.js
+++ b/js/game.js
@@ -697,7 +697,9 @@ export class Level {
             this.toggle_green_objects = false;
         }
 
-        // Now we handle wiring
+        // Now we handle wiring -- three times, because CC2 runs it once per frame, not once per tic
+        this.update_wiring();
+        this.update_wiring();
         this.update_wiring();
 
         // In the event that the player is sliding (and thus not deliberately moving) or has
@@ -1167,6 +1169,12 @@ export class Level {
     // this needs to happen at all
     // FIXME none of this is currently undoable
     update_wiring() {
+        // FIXME:
+        // - make this undoable  :(
+        // - blue tele, red tele, and pink button have different connections
+        // - would like to reuse the walk for blue teles
+        // - currently doesn't notice when circuit block moves sometimes
+
         // Gather every tile that's emitting power.  Along the way, check whether any of them have
         // changed since last tic, so we can skip this work entirely if none did
         let neighbors = [];
@@ -1236,9 +1244,17 @@ export class Level {
                     continue;
                 }
 
-                // Common case: power entering a wired edge and propagating outwards.  The only
-                // special case is that four-way wiring is two separate wires, N/S and E/W
-                if (wire.wire_directions === 0x0f) {
+                // Common case: power entering a wired edge and propagating outwards.  There are a
+                // couple special cases:
+                if (wire.type.wire_propagation_mode === 'none') {
+                    // This tile type has wires, but none of them connect to each other
+                    cell.powered_edges |= bit;
+                    continue;
+                }
+                else if (wire.wire_directions === 0x0f && wire.type.wire_propagation_mode !== 'all') {
+                    // If all four wires are present, they don't actually make a four-way
+                    // connection, but two straight wires that don't connect to each other (with the
+                    // exception of blue teleporters)
                     cell.powered_edges |= bit;
                     cell.powered_edges |= DIRECTIONS[DIRECTIONS[source_direction].opposite].bit;
                 }
diff --git a/js/tileset.js b/js/tileset.js
index 4b215d4..1628e47 100644
--- a/js/tileset.js
+++ b/js/tileset.js
@@ -1126,6 +1126,7 @@ export class Tileset {
                 // Draw the base tile
                 blit(drawspec.base[0], drawspec.base[1]);
 
+                // FIXME some tiles don't have active wiring on all sides...
                 // Draw the wire part as a single rectangle, initially just a small dot in the
                 // center, but extending out to any edge that has a wire present
                 let x0 = 0.5 - wire_radius;
diff --git a/js/tiletypes.js b/js/tiletypes.js
index ac540dd..00298ec 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -1118,6 +1118,7 @@ const TILE_TYPES = {
     // FIXME blue teleporters transmit current 4 ways.  red don't transmit it at all
     teleport_blue: {
         draw_layer: DRAW_LAYERS.terrain,
+        wire_propagation_mode: 'all',
         teleport_dest_order(me, level, other) {
             if (! me.wire_directions) {
                 // TODO cc2 has a bug where, once it wraps around to the bottom right, it seems to
@@ -1208,6 +1209,7 @@ const TILE_TYPES = {
     },
     teleport_red: {
         draw_layer: DRAW_LAYERS.terrain,
+        wire_propagation_mode: 'none',
         teleport_try_all_directions: true,
         teleport_allow_override: true,
         _is_active(me) {
@@ -1451,6 +1453,7 @@ const TILE_TYPES = {
     button_pink: {
         draw_layer: DRAW_LAYERS.terrain,
         is_power_source: true,
+        wire_propagation_mode: 'none',
         get_emitting_edges(me, level) {
             // We emit current as long as there's an actor fully on us
             if (me.cell.some(tile => tile.type.is_actor && tile.movement_cooldown === 0)) {