diff --git a/assets/_sheet_prun4.png b/assets/_sheet_prun4.png
new file mode 100644
index 0000000..987b94c
Binary files /dev/null and b/assets/_sheet_prun4.png differ
diff --git a/assets/p_run1.png b/assets/p_run1.png
index 2014c7e..68a33ca 100644
Binary files a/assets/p_run1.png and b/assets/p_run1.png differ
diff --git a/assets/p_run2.png b/assets/p_run2.png
index 07ff5dd..c58dfa2 100644
Binary files a/assets/p_run2.png and b/assets/p_run2.png differ
diff --git a/assets/p_run3.png b/assets/p_run3.png
new file mode 100644
index 0000000..21feee7
Binary files /dev/null and b/assets/p_run3.png differ
diff --git a/assets/p_run4.png b/assets/p_run4.png
new file mode 100644
index 0000000..a4b0f90
Binary files /dev/null and b/assets/p_run4.png differ
diff --git a/index.html b/index.html
index facb77b..791c9e9 100644
--- a/index.html
+++ b/index.html
@@ -97,6 +97,6 @@
     <p id="build"></p>
   </div>
 </div>
-<script type="module" src="main.js?v=56"></script>
+<script type="module" src="main.js?v=57"></script>
 </body>
 </html>
diff --git a/render.js b/render.js
index 6d69c62..0f1a24b 100644
--- a/render.js
+++ b/render.js
@@ -155,9 +155,9 @@ export function proj(x, y, z) {
 
 // ---------------------------------------------------------------- sprites ----
 // assets/<name>.png; game falls back to code-drawn figures until sprites load.
-const SPRV = 51; // asset cache-buster — bump with main.js?v=N (see the img.src note below)
+const SPRV = 52; // asset cache-buster — bump with main.js?v=N (see the img.src note below)
 const SPR = {};
-for (const n of ['p_idle1','p_idle2','p_bounce','p_bounce2','p_toss','p_smash','p_run1','p_run2','p_swing1','p_swing2',
+for (const n of ['p_idle1','p_idle2','p_bounce','p_bounce2','p_toss','p_smash','p_run1','p_run2','p_run3','p_run4','p_swing1','p_swing2',
                  'o_idle1','o_idle2','o_bounce','o_bounce2','o_toss','o_smash','o_run1','o_run2','o_swing1','o_swing2',
                  'x_ump','x_boyrun1','x_boyrun2','x_boyrun3','x_boyrun4','x_crowd','x_crowd2','x_ads',
                  'x_boymop1','x_boymop2','x_boymop3','x_boymop4', // the push cycle, used only while he is stopped and working
@@ -434,7 +434,11 @@ function drawChar(ch) {
     const rising = Math.sin(w) * Math.cos(w) > 0;
     name = pre + (rising ? 'bounce2' : 'bounce'); // hand up while the ball rises, pat down exactly at the apex
   }
-  if (ch.pose === 'run') name = pre + (Math.floor(ch.runT * 9) % 2 ? 'run1' : 'run2');
+  // Four-frame run where the frames exist (the player), two where they don't (the opponent). Same
+  // CYCLE rate either way — more frames subdivide the stride, they do not speed it up, exactly as
+  // ZFRAMES does for the shamblers.
+  const runN = SPR[pre + 'run4'] ? 4 : 2;
+  if (ch.pose === 'run') name = pre + 'run' + (Math.floor(ch.runT * 4.5 * runN) % runN + 1);
   if (receiverWaiting) name = pre + (sway > 0 ? 'run1' : 'run2'); // split-step shuffle
   if (ch.pose === 'swing') name = pre + (ch.poseT < 0.15 ? 'swing1' : 'swing2');
   if (ch.pose === 'serve') name = pre + (G.phase === 'toss' ? 'toss' : 'smash');
@@ -442,7 +446,7 @@ function drawChar(ch) {
   // Auto-fire: the idle sprite carries a racket at his hip AND drawMgRacket puts one in his hands —
   // two rackets. The run frames are the racket-less art, so he jogs on the spot instead.
   if (ch.side === 'P' && ch.pose === 'idle' && G.mode === 'splatter' && (G.horde || G.mgT > 0))
-    name = pre + (Math.floor(G.idleT * 6) % 2 ? 'run1' : 'run2');
+    name = pre + 'run' + (Math.floor(G.idleT * 3 * runN) % runN + 1);
   const img = SPR[name];
   drawShadow(p.x, p.y, hpx * 0.22, hpx * 0.06);
   if (img) {