diff --git a/README.md b/README.md
index ecbc900..c2bfeb1 100644
--- a/README.md
+++ b/README.md
@@ -2946,7 +2946,7 @@ while all(event.type != pg.QUIT for event in pg.event.get()):
 <bool> = <Rect>.collidepoint((x, y))            # Tests if a point is inside a rectangle.
 <bool> = <Rect>.colliderect(<Rect>)             # Tests if two rectangles overlap.
 <int>  = <Rect>.collidelist(<list_of_Rect>)     # Returns index of first colliding Rect or -1.
-<list> = <Rect>.collidelistall(<list_of_Rect>)  # Returns indices of all colliding Rects.
+<list> = <Rect>.collidelistall(<list_of_Rect>)  # Returns indexes of all colliding Rects.
 ```
 
 ### Surface
@@ -3032,17 +3032,17 @@ def run(screen, images, mario, tiles):
 def update_speed(mario, tiles, pressed):
     x, y = mario.spd
     x += 2 * ((D.e in pressed) - (D.w in pressed))
-    x -= x / abs(x) if x else 0
+    x -= x // abs(x) if x else 0
     y += 1 if D.s not in get_boundaries(mario.rect, tiles) else (-10 if D.n in pressed else 0)
     mario.spd = P(*[max(-limit, min(limit, s)) for limit, s in zip(MAX_SPEED, P(x, y))])
 
 def update_position(mario, tiles):
-    old_p, delta = mario.rect.topleft, P(0, 0)
+    new_p = mario.rect.topleft
     larger_speed = max(abs(s) for s in mario.spd)
-    for _ in range(int(larger_speed)):
+    for _ in range(larger_speed):
         mario.spd = stop_on_collision(mario.spd, get_boundaries(mario.rect, tiles))
-        delta = P(*[a + s/larger_speed for a, s in zip(delta, mario.spd)])
-        mario.rect.topleft = [sum(pair) for pair in zip(old_p, delta)]
+        new_p = P(*[a + s/larger_speed for a, s in zip(new_p, mario.spd)])
+        mario.rect.topleft = new_p
 
 def get_boundaries(rect, tiles):
     deltas = {D.n: P(0, -1), D.e: P(1, 0), D.s: P(0, 1), D.w: P(-1, 0)}
diff --git a/index.html b/index.html
index e66c9b7..93ff088 100644
--- a/index.html
+++ b/index.html
@@ -2505,7 +2505,7 @@ rect = pg.Rect(<span class="hljs-number">240</span>, <span class="hljs-number">2
 <pre><code class="python language-python hljs">&lt;bool&gt; = &lt;Rect&gt;.collidepoint((x, y))            <span class="hljs-comment"># Tests if a point is inside a rectangle.</span>
 &lt;bool&gt; = &lt;Rect&gt;.colliderect(&lt;Rect&gt;)             <span class="hljs-comment"># Tests if two rectangles overlap.</span>
 &lt;int&gt;  = &lt;Rect&gt;.collidelist(&lt;list_of_Rect&gt;)     <span class="hljs-comment"># Returns index of first colliding Rect or -1.</span>
-&lt;list&gt; = &lt;Rect&gt;.collidelistall(&lt;list_of_Rect&gt;)  <span class="hljs-comment"># Returns indices of all colliding Rects.</span>
+&lt;list&gt; = &lt;Rect&gt;.collidelistall(&lt;list_of_Rect&gt;)  <span class="hljs-comment"># Returns indexes of all colliding Rects.</span>
 </code></pre>
 <div><h3 id="surface">Surface</h3><p><strong>Object for representing images.</strong></p><pre><code class="python language-python hljs">&lt;Surf&gt; = pg.display.set_mode((width, height))   <span class="hljs-comment"># Returns the display surface.</span>
 &lt;Surf&gt; = pg.Surface((width, height))            <span class="hljs-comment"># Creates a new surface.</span>
@@ -2576,17 +2576,17 @@ SIZE, MAX_SPEED = <span class="hljs-number">50</span>, P(<span class="hljs-numbe
 <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">update_speed</span><span class="hljs-params">(mario, tiles, pressed)</span>:</span>
     x, y = mario.spd
     x += <span class="hljs-number">2</span> * ((D.e <span class="hljs-keyword">in</span> pressed) - (D.w <span class="hljs-keyword">in</span> pressed))
-    x -= x / abs(x) <span class="hljs-keyword">if</span> x <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>
+    x -= x // abs(x) <span class="hljs-keyword">if</span> x <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>
     y += <span class="hljs-number">1</span> <span class="hljs-keyword">if</span> D.s <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> get_boundaries(mario.rect, tiles) <span class="hljs-keyword">else</span> (<span class="hljs-number">-10</span> <span class="hljs-keyword">if</span> D.n <span class="hljs-keyword">in</span> pressed <span class="hljs-keyword">else</span> <span class="hljs-number">0</span>)
     mario.spd = P(*[max(-limit, min(limit, s)) <span class="hljs-keyword">for</span> limit, s <span class="hljs-keyword">in</span> zip(MAX_SPEED, P(x, y))])
 
 <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">update_position</span><span class="hljs-params">(mario, tiles)</span>:</span>
-    old_p, delta = mario.rect.topleft, P(<span class="hljs-number">0</span>, <span class="hljs-number">0</span>)
+    new_p = mario.rect.topleft
     larger_speed = max(abs(s) <span class="hljs-keyword">for</span> s <span class="hljs-keyword">in</span> mario.spd)
-    <span class="hljs-keyword">for</span> _ <span class="hljs-keyword">in</span> range(int(larger_speed)):
+    <span class="hljs-keyword">for</span> _ <span class="hljs-keyword">in</span> range(larger_speed):
         mario.spd = stop_on_collision(mario.spd, get_boundaries(mario.rect, tiles))
-        delta = P(*[a + s/larger_speed <span class="hljs-keyword">for</span> a, s <span class="hljs-keyword">in</span> zip(delta, mario.spd)])
-        mario.rect.topleft = [sum(pair) <span class="hljs-keyword">for</span> pair <span class="hljs-keyword">in</span> zip(old_p, delta)]
+        new_p = P(*[a + s/larger_speed <span class="hljs-keyword">for</span> a, s <span class="hljs-keyword">in</span> zip(new_p, mario.spd)])
+        mario.rect.topleft = new_p
 
 <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_boundaries</span><span class="hljs-params">(rect, tiles)</span>:</span>
     deltas = {D.n: P(<span class="hljs-number">0</span>, <span class="hljs-number">-1</span>), D.e: P(<span class="hljs-number">1</span>, <span class="hljs-number">0</span>), D.s: P(<span class="hljs-number">0</span>, <span class="hljs-number">1</span>), D.w: P(<span class="hljs-number">-1</span>, <span class="hljs-number">0</span>)}