diff --git a/rogueviz/fifteen.cpp b/rogueviz/fifteen.cpp
index a64218ee..c000d4b6 100644
--- a/rogueviz/fifteen.cpp
+++ b/rogueviz/fifteen.cpp
@@ -140,6 +140,7 @@ void scramble() {
   }
 
 bool draw_fifteen(cell *c, const shiftmatrix& V) {
+  hr::addaura(tC0(V), darkened(0x0000FF), 0);
   lastexplore = turncount;
   if(!fif.count(c)) { c->land = laNone; c->wall = waChasm; return false; }
   check_move();