diff --git a/level.gd b/level.gd
index 46d99b9..018a176 100644
--- a/level.gd
+++ b/level.gd
@@ -28,32 +28,20 @@ func load(path):
 	win_commands = helpers.read_file(path+"/win", "exit 1\n")
 
 func construct():
-	# We're actually destroying stuff here.
-	# Make sure that active_repository is in a temporary directory.
-	helpers.careful_delete(_active_repository_path)
-	helpers.careful_delete(_goal_repository_path)
-	
 	_construct_repo(start_commands +"\n"+ goal_commands, _goal_repository_path)
 	_construct_repo(start_commands, _active_repository_path)
 	
-	var win_script_target = game.tmp_prefix_outside+"/win"
-	helpers.write_file(win_script_target, win_commands)
-	
 func _construct_repo(script_content, path):
-	# Becase in an exported game, all assets are in a .pck file, we need to put
-	# the script somewhere in the filesystem.
-	
-	var script_path_outside = game.tmp_prefix_outside+"/git-hydra-script"
-	var script_path_inside = game.tmp_prefix_inside+"/git-hydra-script"
-	helpers.write_file(script_path_outside, script_content)
+	# We're actually destroying stuff here.
+	# Make sure that active_repository is in a temporary directory.
+	helpers.careful_delete(path)
 	
 	game.global_shell.run("mkdir " + path)
 	game.global_shell.cd(path)
 	game.global_shell.run("git init")
 	game.global_shell.run("git symbolic-ref HEAD refs/heads/main")
-	# Read stdin from /dev/null so that interactive commands don't block.
-	game.global_shell.run("bash "+script_path_inside+" </dev/null")
+	game.global_shell.run(script_content)
 
 func check_win():
 	game.global_shell.cd(_active_repository_path)
-	return game.global_shell.run("bash %s/win 2>/dev/null >/dev/null && echo yes || echo no" % game.tmp_prefix_inside) == "yes\n"
+	return game.global_shell.run("function win { %s }; win 2>/dev/null >/dev/null && echo yes || echo no" % win_commands) == "yes\n"
diff --git a/levels/bottom-up/commit-parents/win b/levels/bottom-up/commit-parents/win
index ce20826..26564b6 100644
--- a/levels/bottom-up/commit-parents/win
+++ b/levels/bottom-up/commit-parents/win
@@ -3,8 +3,8 @@ COMMITS=$(git cat-file --batch-check='%(objectname) %(objecttype)' --batch-all-o
 for COMMIT in $COMMITS; do
     echo a commit named $COMMIT
     if [ $(git rev-list $COMMIT | wc -l) -ge 3 ]; then
-        exit 0
+        return 0
     fi
 done
 
-exit 1
+return 1
diff --git a/levels/bottom-up/commit-rhombus/win b/levels/bottom-up/commit-rhombus/win
index 2364153..5492217 100644
--- a/levels/bottom-up/commit-rhombus/win
+++ b/levels/bottom-up/commit-rhombus/win
@@ -3,8 +3,8 @@ COMMITS=$(git cat-file --batch-check='%(objectname) %(objecttype)' --batch-all-o
 for COMMIT in $COMMITS; do
     # My first parent's parents has to be the same as my second parent's parent.
     if [ "$(git rev-parse --verify -q $COMMIT^1^)" = "$(git rev-parse --verify -q $COMMIT^2^)" ]; then
-        exit 0
+        return 0
     fi
 done
 
-exit 1
+return 1
diff --git a/levels/bottom-up/puzzle-trees-all-the-way-down/win b/levels/bottom-up/puzzle-trees-all-the-way-down/win
index 4a8a6d2..90fca71 100644
--- a/levels/bottom-up/puzzle-trees-all-the-way-down/win
+++ b/levels/bottom-up/puzzle-trees-all-the-way-down/win
@@ -8,11 +8,11 @@ for TREE in $TREES; do
             if [ "$(git cat-file -p $TREE2 | wc -l)" -eq 1 ]; then
                 if [ "$(git cat-file -p $TREE2 | cut -f1 | grep tree | wc -l)" -eq 1 ]; then
                     # Same for its child! \o/
-                    exit 0
+                    return 0
                 fi
             fi
         fi
     fi
 done
 
-exit 1
+return 1
diff --git a/levels/bottom-up/symref-no-deref/win b/levels/bottom-up/symref-no-deref/win
index 3b11531..2e3e24f 100644
--- a/levels/bottom-up/symref-no-deref/win
+++ b/levels/bottom-up/symref-no-deref/win
@@ -1,2 +1,2 @@
-git symbolic-ref refs/fries && exit 1
+git symbolic-ref refs/fries && return 1
 test "$(git show-ref -s refs/fries)" = "035e2968dafeea08e46e8fe6743cb8123e8b9aa6"
diff --git a/levels/bottom-up/tree-nested/win b/levels/bottom-up/tree-nested/win
index e0cc491..e6f6488 100644
--- a/levels/bottom-up/tree-nested/win
+++ b/levels/bottom-up/tree-nested/win
@@ -8,9 +8,9 @@ for OUTER_TREE in $TREES; do
         TREE_CHILD=$(git cat-file -p $OUTER_TREE | cut -f1 | grep tree | cut -d" " -f3)
         NUMBER_OF_BLOB_CHILDREN_OF_TREE_CHILD=$(git cat-file -p $TREE_CHILD | cut -f2 -d" " | grep blob | wc -l)
         if [ $NUMBER_OF_BLOB_CHILDREN_OF_TREE_CHILD -eq 2 ]; then
-            exit 0
+            return 0
         fi
     fi
 done
 
-exit 1
+return 1