diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index 10d3044..6edb6a0 100755
Binary files a/overlay/rootfs/usr/bin/tetris and b/overlay/rootfs/usr/bin/tetris differ
diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index 10d3044..6edb6a0 100755
Binary files a/prebuilt/games/usr/bin/tetris and b/prebuilt/games/usr/bin/tetris differ
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index 1a6e8e7..34f2781 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -279,27 +279,40 @@ static void render() {
     }
   }
 
+  // vertical separator line between the playfield and the side panel
+  int sepX = px0 + PCOLS * CELL + 6;
+  XSetForeground(dpy, gc, C_FG);
+  XDrawLine(dpy, back, gc, sepX, py0, sepX, py0 + PROWS * CELL);
+
   // side panel
   int sx = px0 + PCOLS * CELL + 12;
   draw_text(sx, py0, 1, C_DIM, "NEXT");
+  // framed preview box for the next piece
+  int boxY = py0 + 10;
+  int boxH = 48;
+  XSetForeground(dpy, gc, C_DIM);
+  XDrawRectangle(dpy, back, gc, sx, boxY, winW - sx - 4, boxH);
   int nc[4][2];
   piece_cells(nextType, 0, nc);
   int minx = 4, miny = 4, maxx = -1, maxy = -1;
   for (int i = 0; i < 4; i++) {
     minx = nc[i][0] < minx ? nc[i][0] : minx;
-    miny = nc[i][1] < miny ? nc[i][1] : miny;
+    miny = nc[i][1] < miny ? miny : miny;
     maxx = nc[i][0] > maxx ? nc[i][0] : maxx;
-    maxy = nc[i][1] > maxy ? nc[i][1] : maxy;
+    maxy = nc[i][1] > maxy ? maxy : maxy;
   }
-  int pcell = 6;
-  int nx0 = sx + 2, ny0 = py0 + 10;
+  int pcell = 11;                       // larger next-piece preview
+  int pcols = maxx - minx + 1;
+  int prows = maxy - miny + 1;
+  int nx0 = sx + ((winW - sx - 4) - pcols * pcell) / 2;
+  int ny0 = boxY + (boxH - prows * pcell) / 2;
   XSetForeground(dpy, gc, C_HEAD);
   for (int i = 0; i < 4; i++) {
     int cx = nx0 + (nc[i][0] - minx) * pcell;
     int cy = ny0 + (nc[i][1] - miny) * pcell;
     XFillRectangle(dpy, back, gc, cx, cy, pcell, pcell);
   }
-  int ty = py0 + 60;
+  int ty = boxY + boxH + 6;
   char buf[32];
   snprintf(buf, sizeof(buf), "SCORE %d", score); draw_text(sx, ty, 1, C_DIM, buf);
   snprintf(buf, sizeof(buf), "LINES %d", lines); draw_text(sx, ty + 9, 1, C_DIM, buf);