diff --git a/courses/reactive/resources/source-files/CompletedGame.rkt b/courses/reactive/resources/source-files/CompletedGame.rkt
index 0ab30f007..7c11b12ac 100644
--- a/courses/reactive/resources/source-files/CompletedGame.rkt
+++ b/courses/reactive/resources/source-files/CompletedGame.rkt
@@ -22,7 +22,7 @@
 (define NEXT (make-world "asleep" 40 210 580 820 100))
 
 ;; GRAPHICS
-(define BACKGROUND (bitmap "Teachpacks/teachpack-images/BG.jpg"))
+(define BACKGROUND (bitmap "Teachpacks/teachpack-images/bg.jpg"))
 (define DANGER (scale .7 (bitmap "Teachpacks/teachpack-images/wumpus.png")))
 (define FLOCK (bitmap "Teachpacks/teachpack-images/bats.png"))
 (define PLAYER (scale .7 (bitmap "Teachpacks/teachpack-images/archer.png")))
diff --git a/courses/reactive/resources/source-files/Game5.rkt b/courses/reactive/resources/source-files/Game5.rkt
index f03c335a7..43742c96c 100644
--- a/courses/reactive/resources/source-files/Game5.rkt
+++ b/courses/reactive/resources/source-files/Game5.rkt
@@ -13,7 +13,7 @@
 (define NEXT (make-world "asleep" 40 210 580 820))
 
 ;; GRAPHICS
-(define BACKGROUND (bitmap "Teachpacks/teachpack-images/BG.jpg"))
+(define BACKGROUND (bitmap "Teachpacks/teachpack-images/bg.jpg"))
 (define DANGER (scale .7 (bitmap "Teachpacks/teachpack-images/wumpus.png")))
 (define FLOCK (bitmap "Teachpacks/teachpack-images/bats.png"))
 (define PLAYER (scale .7 (bitmap "Teachpacks/teachpack-images/archer.png")))
diff --git a/courses/reactive/resources/source-files/Game6.rkt b/courses/reactive/resources/source-files/Game6.rkt
index 9c2b159c7..e0b929f79 100644
--- a/courses/reactive/resources/source-files/Game6.rkt
+++ b/courses/reactive/resources/source-files/Game6.rkt
@@ -13,7 +13,7 @@
 (define NEXT (make-world "asleep" 40 210 580 820))
 
 ;; GRAPHICS
-(define BACKGROUND (bitmap "Teachpacks/teachpack-images/BG.jpg"))
+(define BACKGROUND (bitmap "Teachpacks/teachpack-images/bg.jpg"))
 (define DANGER (scale .7 (bitmap "Teachpacks/teachpack-images/wumpus.png")))
 (define FLOCK (bitmap "Teachpacks/teachpack-images/bats.png"))
 (define PLAYER (scale .7 (bitmap "Teachpacks/teachpack-images/archer.png")))
diff --git a/courses/reactive/resources/source-files/Game7.rkt b/courses/reactive/resources/source-files/Game7.rkt
index f96a63247..52def55b2 100644
--- a/courses/reactive/resources/source-files/Game7.rkt
+++ b/courses/reactive/resources/source-files/Game7.rkt
@@ -13,7 +13,7 @@
 (define NEXT (make-world "asleep" 40 210 580 820))
 
 ;; GRAPHICS
-(define BACKGROUND (bitmap "Teachpacks/teachpack-images/BG.jpg"))
+(define BACKGROUND (bitmap "Teachpacks/teachpack-images/bg.jpg"))
 (define DANGER (scale .7 (bitmap "Teachpacks/teachpack-images/wumpus.png")))
 (define FLOCK (bitmap "Teachpacks/teachpack-images/bats.png"))
 (define PLAYER (scale .7 (bitmap "Teachpacks/teachpack-images/archer.png")))
diff --git a/courses/reactive/resources/source-files/Game8.rkt b/courses/reactive/resources/source-files/Game8.rkt
index 922297dca..ffdb7a108 100644
--- a/courses/reactive/resources/source-files/Game8.rkt
+++ b/courses/reactive/resources/source-files/Game8.rkt
@@ -18,7 +18,7 @@
 (define NEXT (make-world "asleep" 40 210 580 820))
 
 ;; GRAPHICS
-(define BACKGROUND (bitmap "Teachpacks/teachpack-images/BG.jpg"))
+(define BACKGROUND (bitmap "Teachpacks/teachpack-images/bg.jpg"))
 (define DANGER (scale .7 (bitmap "Teachpacks/teachpack-images/wumpus.png")))
 (define FLOCK (bitmap "Teachpacks/teachpack-images/bats.png"))
 (define PLAYER (scale .7 (bitmap "Teachpacks/teachpack-images/archer.png")))