diff --git a/apps/web/src/arcade-games/know-your-world/components/DrillDownMapSelector.tsx b/apps/web/src/arcade-games/know-your-world/components/DrillDownMapSelector.tsx
index 915ba488..04c9afb9 100644
--- a/apps/web/src/arcade-games/know-your-world/components/DrillDownMapSelector.tsx
+++ b/apps/web/src/arcade-games/know-your-world/components/DrillDownMapSelector.tsx
@@ -90,7 +90,13 @@ const PLANETS: PlanetData[] = [
   { id: 'mercury', name: 'Mercury', color: '#b0b0b0', size: 0.38 },
   { id: 'venus', name: 'Venus', color: '#e6c87a', size: 0.95 },
   { id: 'mars', name: 'Mars', color: '#c1440e', size: 0.53 },
-  { id: 'jupiter', name: 'Jupiter', color: '#d8ca9d', size: 2.0, hasStripes: true },
+  {
+    id: 'jupiter',
+    name: 'Jupiter',
+    color: '#d8ca9d',
+    size: 2.0,
+    hasStripes: true,
+  },
   { id: 'saturn', name: 'Saturn', color: '#ead6b8', size: 1.7, hasRings: true },
 ]
 
@@ -152,7 +158,10 @@ export function DrillDownMapSelector({
   const [sizeRangePreview, setSizeRangePreview] = useState<RangePreviewState<RegionSize> | null>(
     null
   )
-  const [containerDimensions, setContainerDimensions] = useState({ width: 0, height: 0 })
+  const [containerDimensions, setContainerDimensions] = useState({
+    width: 0,
+    height: 0,
+  })
   const containerRef = useRef<HTMLDivElement>(null)
   // Track which region name is being hovered in the popover (for zoom preview)
   const [previewRegionName, setPreviewRegionName] = useState<string | null>(null)
@@ -477,7 +486,10 @@ export function DrillDownMapSelector({
       }
     }
 
-    return { previewAddRegions: addRegions, previewRemoveRegions: removeRegions }
+    return {
+      previewAddRegions: addRegions,
+      previewRemoveRegions: removeRegions,
+    }
   }, [sizeRangePreview, currentLevel, path, selectedContinent, includeSizes])
 
   // Compute the label to display for the hovered region
@@ -634,7 +646,12 @@ export function DrillDownMapSelector({
               }
             : null
         })
-        .filter(Boolean) as Array<{ id: string; label: string; emoji: string; path: SelectionPath }>
+        .filter(Boolean) as Array<{
+        id: string
+        label: string
+        emoji: string
+        path: SelectionPath
+      }>
     }
 
     return []
@@ -761,205 +778,76 @@ export function DrillDownMapSelector({
     >
       {/* Breadcrumb Navigation - different styles for fillContainer vs normal */}
       {fillContainer ? (
-        /* Navigation breadcrumb - positioned well below nav bar */
+        /* Breadcrumb navigation overlay for full-screen mode */
         <div
           data-element="navigation-overlay"
           className={css({
             position: 'absolute',
-            top: 'calc(var(--app-nav-height, 92px) + 72px)',
-            left: { base: '16px', sm: '24px' },
+            top: '164px',
+            left: { base: '12px', sm: '24px' },
             zIndex: 50,
             display: 'flex',
-            alignItems: 'center',
-            gap: '3',
-            padding: '10px 16px',
-            bg: isDark
-              ? 'linear-gradient(135deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.95) 100%)'
-              : 'linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%)',
-            backdropFilter: 'blur(12px)',
-            border: '1px solid',
-            borderColor: isDark ? 'rgba(71, 85, 105, 0.5)' : 'rgba(203, 213, 225, 0.8)',
-            rounded: 'full',
-            shadow: isDark
-              ? '0 4px 20px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05)'
-              : '0 4px 20px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.8)',
+            flexDirection: { base: 'column', sm: 'row' },
+            alignItems: { base: 'flex-start', sm: 'center' },
+            gap: { base: '1', sm: '2' },
+            padding: '2',
+            bg: isDark ? 'gray.800' : 'gray.100',
+            rounded: 'xl',
+            shadow: 'lg',
+            fontSize: 'sm',
           })}
         >
-          {currentLevel > 0 ? (
-            <>
-              {/* Back button with mini-map */}
-              {(() => {
-                const backToWorld = currentLevel === 1
-                const backToContinentId = currentLevel === 2 ? path[0] : null
-                const backLabel = backToWorld
-                  ? 'World'
-                  : (CONTINENTS.find((c) => c.id === backToContinentId)?.name ?? 'Continent')
-                const backEmoji = backToWorld
-                  ? '🌍'
-                  : (CONTINENTS.find((c) => c.id === backToContinentId)?.emoji ?? '🗺️')
-
-                // Get viewBox and regions for the mini-map preview
-                const backViewBox = backToWorld
-                  ? WORLD_MAP.viewBox
-                  : backToContinentId
-                    ? calculateContinentViewBox(
-                        WORLD_MAP.regions,
-                        backToContinentId,
-                        WORLD_MAP.viewBox,
-                        'world'
-                      )
-                    : WORLD_MAP.viewBox
-                const backRegions = backToWorld
-                  ? WORLD_MAP.regions
-                  : backToContinentId
-                    ? filterRegionsByContinent(WORLD_MAP.regions, backToContinentId)
-                    : []
-
-                return (
-                  <button
-                    data-action="navigate-back"
-                    onClick={handleZoomOut}
-                    className={css({
-                      display: 'flex',
-                      alignItems: 'center',
-                      gap: '10px',
-                      padding: '6px 12px 6px 8px',
-                      bg: isDark ? 'rgba(51, 65, 85, 0.6)' : 'rgba(241, 245, 249, 0.8)',
-                      border: '1px solid',
-                      borderColor: isDark ? 'rgba(71, 85, 105, 0.4)' : 'rgba(203, 213, 225, 0.6)',
-                      rounded: 'full',
-                      cursor: 'pointer',
-                      transition: 'all 0.2s ease',
-                      _hover: {
-                        bg: isDark ? 'rgba(71, 85, 105, 0.7)' : 'rgba(226, 232, 240, 0.9)',
-                        transform: 'translateX(-2px)',
-                      },
-                    })}
-                  >
-                    {/* Mini-map preview */}
-                    <div
-                      className={css({
-                        width: '32px',
-                        height: '32px',
-                        rounded: 'full',
-                        overflow: 'hidden',
-                        border: '2px solid',
-                        borderColor: isDark ? 'rgba(100, 116, 139, 0.5)' : 'rgba(203, 213, 225, 0.8)',
-                        boxShadow: 'inset 0 1px 3px rgba(0,0,0,0.1)',
-                      })}
-                    >
-                      <svg
-                        viewBox={backViewBox}
-                        className={css({
-                          width: '100%',
-                          height: '100%',
-                          display: 'block',
-                        })}
-                        preserveAspectRatio="xMidYMid slice"
-                      >
-                        <rect
-                          x="-10000"
-                          y="-10000"
-                          width="30000"
-                          height="30000"
-                          fill={isDark ? '#1e3a5f' : '#bae6fd'}
-                        />
-                        {backRegions.map((region) => (
-                          <path
-                            key={region.id}
-                            d={region.path}
-                            fill={isDark ? '#64748b' : '#a8d4a8'}
-                            stroke={isDark ? '#475569' : '#86b386'}
-                            strokeWidth={0.3}
-                          />
-                        ))}
-                      </svg>
-                    </div>
-                    <div className={css({ display: 'flex', flexDirection: 'column', alignItems: 'flex-start' })}>
-                      <span
-                        className={css({
-                          fontSize: '10px',
-                          fontWeight: '500',
-                          color: isDark ? 'gray.400' : 'gray.500',
-                          textTransform: 'uppercase',
-                          letterSpacing: '0.05em',
-                          lineHeight: 1,
-                        })}
-                      >
-                        Back to
-                      </span>
-                      <span
-                        className={css({
-                          fontSize: '13px',
-                          fontWeight: '600',
-                          color: isDark ? 'gray.200' : 'gray.700',
-                          lineHeight: 1.2,
-                        })}
-                      >
-                        {backEmoji} {backLabel}
-                      </span>
-                    </div>
-                  </button>
-                )
-              })()}
-
-              {/* Current location badge */}
-              <div
-                className={css({
-                  display: 'flex',
-                  alignItems: 'center',
-                  gap: '8px',
-                  padding: '6px 14px',
-                  bg: isDark
-                    ? 'linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%)'
-                    : 'linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%)',
-                  border: '1px solid',
-                  borderColor: isDark ? 'rgba(59, 130, 246, 0.3)' : 'rgba(59, 130, 246, 0.2)',
-                  rounded: 'full',
-                })}
-              >
-                <span className={css({ fontSize: 'md' })}>
-                  {breadcrumbs[breadcrumbs.length - 1]?.emoji}
-                </span>
+          {breadcrumbs.map((crumb, index) => (
+            <span
+              key={crumb.label}
+              className={css({ display: 'flex', alignItems: 'center', gap: '1' })}
+            >
+              {index > 0 && (
                 <span
                   className={css({
-                    fontSize: '14px',
-                    fontWeight: '600',
-                    color: isDark ? 'white' : 'gray.800',
+                    color: isDark ? 'gray.500' : 'gray.400',
+                    display: { base: 'none', sm: 'inline' },
                   })}
                 >
-                  {breadcrumbs[breadcrumbs.length - 1]?.label}
+                  ›
                 </span>
-              </div>
-            </>
-          ) : (
-            /* World level - current location badge */
-            <div
-              className={css({
-                display: 'flex',
-                alignItems: 'center',
-                gap: '8px',
-                padding: '6px 14px',
-                bg: isDark
-                  ? 'linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%)'
-                  : 'linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%)',
-                border: '1px solid',
-                borderColor: isDark ? 'rgba(59, 130, 246, 0.3)' : 'rgba(59, 130, 246, 0.2)',
-                rounded: 'full',
-              })}
-            >
-              <span className={css({ fontSize: 'md' })}>🌍</span>
-              <span
-                className={css({
-                  fontSize: '14px',
-                  fontWeight: '600',
-                  color: isDark ? 'white' : 'gray.800',
-                })}
-              >
-                World
-              </span>
-            </div>
-          )}
+              )}
+              {crumb.isClickable ? (
+                <button
+                  data-action={`nav-${crumb.label.toLowerCase().replace(/\s/g, '-')}`}
+                  onClick={() => handleBreadcrumbClick(crumb.path)}
+                  className={css({
+                    display: 'flex',
+                    alignItems: 'center',
+                    gap: '1',
+                    color: isDark ? 'blue.400' : 'blue.600',
+                    cursor: 'pointer',
+                    background: 'none',
+                    border: 'none',
+                    padding: '0',
+                    font: 'inherit',
+                    _hover: { textDecoration: 'underline' },
+                  })}
+                >
+                  <span>{crumb.emoji}</span>
+                  <span>{crumb.label}</span>
+                </button>
+              ) : (
+                <span
+                  className={css({
+                    display: 'flex',
+                    alignItems: 'center',
+                    gap: '1',
+                    fontWeight: 'bold',
+                    color: isDark ? 'gray.100' : 'gray.800',
+                  })}
+                >
+                  <span>{crumb.emoji}</span>
+                  <span>{crumb.label}</span>
+                </span>
+              )}
+            </span>
+          ))}
         </div>
       ) : (
         /* Normal breadcrumb for non-fillContainer mode */
@@ -977,7 +865,11 @@ export function DrillDownMapSelector({
           {breadcrumbs.map((crumb, index) => (
             <span
               key={crumb.label}
-              className={css({ display: 'flex', alignItems: 'center', gap: '1' })}
+              className={css({
+                display: 'flex',
+                alignItems: 'center',
+                gap: '1',
+              })}
             >
               {index > 0 && (
                 <span className={css({ color: isDark ? 'gray.500' : 'gray.400' })}>›</span>
@@ -1153,20 +1045,15 @@ export function DrillDownMapSelector({
           data-element="region-size-filters"
           className={css({
             position: 'absolute',
-            top: fillContainer ? 'calc(var(--app-nav-height, 92px) + 72px)' : '3',
-            right: { base: '16px', sm: '24px' },
-            padding: '12px',
-            bg: isDark
-              ? 'linear-gradient(135deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.95) 100%)'
-              : 'linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%)',
-            backdropFilter: 'blur(12px)',
-            border: '1px solid',
-            borderColor: isDark ? 'rgba(71, 85, 105, 0.5)' : 'rgba(203, 213, 225, 0.8)',
+            top: fillContainer ? '164px' : '3',
+            right: { base: '8px', sm: '24px' },
+            padding: { base: '2', sm: '3' },
+            bg: isDark ? 'gray.800' : 'gray.100',
             rounded: 'xl',
-            shadow: isDark
-              ? '0 4px 20px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05)'
-              : '0 4px 20px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.8)',
+            shadow: 'lg',
             zIndex: 10,
+            transform: { base: 'scale(0.75)', sm: 'scale(1)' },
+            transformOrigin: 'top right',
           })}
         >
           <RangeThermometer
diff --git a/apps/web/src/arcade-games/know-your-world/components/SetupPhase.tsx b/apps/web/src/arcade-games/know-your-world/components/SetupPhase.tsx
index 8654bd0a..ba54005b 100644
--- a/apps/web/src/arcade-games/know-your-world/components/SetupPhase.tsx
+++ b/apps/web/src/arcade-games/know-your-world/components/SetupPhase.tsx
@@ -184,14 +184,14 @@ export function SetupPhase() {
   const cardTriggerStyles = css({
     display: 'flex',
     alignItems: 'center',
-    gap: { base: '2', sm: '3' },
-    padding: { base: '2', sm: '3' },
+    gap: { base: '1.5', sm: '3' },
+    padding: { base: '1.5', sm: '3' },
     bg: isDark ? 'gray.700/80' : 'white/80',
     rounded: 'xl',
     cursor: 'pointer',
     transition: 'all 0.15s',
     width: { base: 'calc(50% - 4px)', sm: '260px' },
-    height: { base: '64px', sm: '88px' },
+    height: { base: '48px', sm: '88px' },
     textAlign: 'left',
     _hover: {
       bg: isDark ? 'gray.600/90' : 'white',
@@ -283,7 +283,12 @@ export function SetupPhase() {
           onValueChange={(value) => setMode(value as 'cooperative' | 'race' | 'turn-based')}
         >
           <Select.Trigger className={cardTriggerStyles}>
-            <span className={css({ fontSize: { base: 'xl', sm: '2xl' }, flexShrink: 0 })}>
+            <span
+              className={css({
+                fontSize: { base: 'lg', sm: '2xl' },
+                flexShrink: 0,
+              })}
+            >
               {selectedMode?.emoji}
             </span>
             <div className={css({ flex: 1, minWidth: 0 })}>
@@ -304,7 +309,10 @@ export function SetupPhase() {
                   {selectedMode?.label}
                 </span>
                 <Select.Icon
-                  className={css({ color: isDark ? 'gray.400' : 'gray.500', fontSize: 'xs' })}
+                  className={css({
+                    color: isDark ? 'gray.400' : 'gray.500',
+                    fontSize: 'xs',
+                  })}
                 >
                   ▼
                 </Select.Icon>
@@ -365,7 +373,12 @@ export function SetupPhase() {
           }
         >
           <Select.Trigger className={cardTriggerStyles}>
-            <span className={css({ fontSize: { base: 'xl', sm: '2xl' }, flexShrink: 0 })}>
+            <span
+              className={css({
+                fontSize: { base: 'lg', sm: '2xl' },
+                flexShrink: 0,
+              })}
+            >
               {selectedAssistance?.emoji || '💡'}
             </span>
             <div className={css({ flex: 1, minWidth: 0 })}>
@@ -386,7 +399,10 @@ export function SetupPhase() {
                   {selectedAssistance?.label}
                 </span>
                 <Select.Icon
-                  className={css({ color: isDark ? 'gray.400' : 'gray.500', fontSize: 'xs' })}
+                  className={css({
+                    color: isDark ? 'gray.400' : 'gray.500',
+                    fontSize: 'xs',
+                  })}
                 >
                   ▼
                 </Select.Icon>
@@ -578,7 +594,12 @@ export function SetupPhase() {
               })}
             >
               <span>{regionTheme.icons[0]}</span>
-              <span className={css({ fontSize: { base: 'xs', sm: 'sm' }, marginTop: '-2px' })}>
+              <span
+                className={css({
+                  fontSize: { base: 'xs', sm: 'sm' },
+                  marginTop: '-2px',
+                })}
+              >
                 {regionTheme.icons[1]}
               </span>
             </div>