diff --git a/tools/sprite-generation/gui/src/App.tsx b/tools/sprite-generation/gui/src/App.tsx
index fbcfa5a1..579dfddd 100644
--- a/tools/sprite-generation/gui/src/App.tsx
+++ b/tools/sprite-generation/gui/src/App.tsx
@@ -5,6 +5,7 @@ import { ReviewQueuePage } from './pages/ReviewQueuePage'
 import { CategoryPage } from './pages/CategoryPage'
 import { SpritePage } from './pages/SpritePage'
 import SpriteTheaterPage from './pages/SpriteTheaterPage'
+import TerrainGridPage from './pages/TerrainGridPage'
 import VariantPage from './pages/VariantPage'
 import { SpriteStream } from './SpriteStream'
 import { colors } from './pages/theme'
@@ -51,6 +52,7 @@ export function App(): ReactElement {
             {[
               { to: '/theater', label: 'Theater' },
               { to: '/review', label: 'Review' },
+              { to: '/terrain-grid', label: 'Terrain Grid' },
             ].map(({ to, label }) => {
               const active = location.pathname === to
               return (
@@ -79,6 +81,7 @@ export function App(): ReactElement {
         <Route path="/review" element={<ReviewQueuePage />} />
         <Route path="/category/:name" element={<CategoryPage />} />
         <Route path="/variant/:id" element={<VariantPage />} />
+        <Route path="/terrain-grid" element={<TerrainGridPage />} />
         <Route path="/sprite/*" element={<SpritePage />} />
       </Routes>
     </div>
diff --git a/tools/sprite-generation/gui/src/api.ts b/tools/sprite-generation/gui/src/api.ts
index 05ef78bd..db4f6f11 100644
--- a/tools/sprite-generation/gui/src/api.ts
+++ b/tools/sprite-generation/gui/src/api.ts
@@ -1,4 +1,4 @@
-import type { Sprite, Variant, Stats, GenerationRun, RecentVariant, VariantScore } from './types'
+import type { Sprite, Variant, Stats, GenerationRun, RecentVariant, VariantScore, TerrainGrid, TerrainElevation } from './types'
 
 const API_BASE = '/api'
 
@@ -110,8 +110,8 @@ export async function skipSprite(spriteId: string): Promise<void> {
   return requestVoid(`${API_BASE}/sprites/${spriteId}/skip`, { method: 'POST' })
 }
 
-export async function rejectVariant(variantId: number): Promise<void> {
-  return requestVoid(`${API_BASE}/variants/${variantId}/reject`, { method: 'POST' })
+export async function rejectVariant(variantId: number, reason?: string): Promise<void> {
+  return requestVoid(`${API_BASE}/variants/${variantId}/reject`, jsonPost({ reason: reason ?? null }))
 }
 
 export async function regenerateSprite(spriteId: string, prompt?: string, dimensionId?: number): Promise<void> {
@@ -246,6 +246,7 @@ export async function runPipeline(params?: {
   scorers?: string[]
   skip_process?: boolean
   score_only?: boolean
+  rescore?: boolean
 }): Promise<{ status: string; pid?: number }> {
   return request<{ status: string; pid?: number }>(
     `${API_BASE}/pipeline/run`,
@@ -265,3 +266,7 @@ export async function fetchPipelineStatus(): Promise<{
 export async function fetchPipeline(): Promise<PipelineState> {
   return request<PipelineState>(buildUrl('/pipeline'))
 }
+
+export async function fetchTerrainGrid(elevation: TerrainElevation): Promise<TerrainGrid> {
+  return request<TerrainGrid>(buildUrl('/terrain-grid', { elevation }))
+}
diff --git a/tools/sprite-generation/gui/src/types.ts b/tools/sprite-generation/gui/src/types.ts
index b0aba56e..cfa34c82 100644
--- a/tools/sprite-generation/gui/src/types.ts
+++ b/tools/sprite-generation/gui/src/types.ts
@@ -80,6 +80,14 @@ export interface RecentVariant {
   is_approved: boolean
   scored_by: string | null
   review_tier: number | null
+  /** JSON string of per-dimension quality scores from best passing scorer tier. */
+  quality_json: string | null
+  /** JSON string of gate results from best passing scorer tier. */
+  gates_json: string | null
+  /** Name of the scorer that produced quality_json/gates_json. */
+  quality_scorer: string | null
+  /** Reason provided when this variant was rejected. */
+  reject_reason: string | null
 }
 
 export interface TheaterPage {
@@ -87,6 +95,26 @@ export interface TheaterPage {
   total: number
 }
 
+export type TerrainElevation = 'lowland' | 'highland' | 'alpine'
+
+export interface TerrainGridCell {
+  temp: number
+  moist: number
+  elevation: TerrainElevation
+  sprite_id: string
+  entity_id: string
+  status: 'approved' | 'review' | 'needed' | 'generating' | 'missing'
+  variant_id: number | null
+  raw_path: string | null
+  processed_path: string | null
+  is_approved: boolean
+  variant_count: number
+}
+
+export interface TerrainGrid {
+  cells: TerrainGridCell[]
+}
+
 export interface VariantScore {
   id: number
   variant_id: number