diff --git a/flake.nix b/flake.nix
index 5352a7b..8df3f04 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,6 +13,14 @@
     in {
       schemas = flake-schemas.schemas;
 
+      packages = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.writeShellScriptBin "mineschemer" ''
+        ${pkgs.chez}/bin/scheme --script ${
+          pkgs.writeText "main.scm" (builtins.readFile ./main.scm)
+        } $@
+        '';
+      });
+
       devShells = forEachSupportedSystem ({ pkgs }: {
         default = pkgs.mkShell {
 
diff --git a/main.scm b/main.scm
index b52abc0..abe441f 100644
--- a/main.scm
+++ b/main.scm
@@ -690,13 +690,14 @@
 ; draw-game-over as a separate thing would be nice
 
 ; the game shows -99 when (- num-mines num-flagged) is less than -99
-(define (run-game mines width height)
+(define (run-game mines width height seed)
   (init-window (* width square-width) (* height square-width) "mineschemer")
   (set-target-fps 60)
-  (let ([seed (time-nanosecond (current-time))])
-    (display "seed: ") (display seed)
-    (newline)
-    (random-seed seed))
+
+  (display "seed: ") (display seed)
+  (newline)
+  (random-seed seed)
+
   (let ([skin (load-skin "xp-flowers.bmp")]
 	[game (new-game mines width height)])
     ;; (display skin)
@@ -728,3 +729,15 @@
 ; let's save playing with shaders for later 
 
 ; seems like minesweeper.online doesn't need middle-clicking to be separate (left-clicking performs the same function)
+
+(define (get-nano-seed)
+  (time-nanosecond (current-time)))
+
+(unless (and
+	 (>= 4 (length (command-line-arguments)) 3)
+	 (for-all number? (map string->number (command-line-arguments))))
+  (display "i need 3-4 numbers (MINES WIDTH HEIGHT SEED)")
+  (exit 1))
+
+(apply run-game (append (map string->number (command-line-arguments))
+			(list (get-nano-seed))))