diff --git a/main.scm b/main.scm
index d45810e..16c0a47 100644
--- a/main.scm
+++ b/main.scm
@@ -3,7 +3,6 @@
 ; https://www.mzrg.com/mines/msx/index.html
 ; let's do about the minimum to do what i want
 ; keep the names almost exactly the same for googling's sake
-
 (load-shared-object "libraylib.so")
 
 ; color
@@ -492,14 +491,37 @@
   (vector-ref (game-squares game)
 	      (+ x (* y (game-width game)))))
 
-; preliminary
-(define (game-square-type-at game x y)
-  (define square (game-square-at game x y))
+(define (vector2-adjacent? a b)
+  (and (<= (abs (- (vector2-x a) (vector2-x b))) 1)
+       (<= (abs (- (vector2-y a) (vector2-y b))) 1)))
+
+(define (pair-adjacent? a b)
+  (and (<= (abs (- (car a) (car b))) 1)
+       (<= (abs (- (cdr a) (cdr b))) 1)))
+
+(define (square-mouse-over)
+  (cons (floor (/ (get-mouse-x) square-width))
+	(floor (/ (get-mouse-y) square-width))))
+
+(define (square-pressed? x y)
+  (or
+   (and (button-down? 'left) (equal? (cons x y) (square-mouse-over)))
+   (and (button-down? 'middle) (pair-adjacent? (cons x y) (square-mouse-over)))))
+
+(define (square-type square x y)
   (cond
    [(square-flagged? square) 'flag]
+   [(not (square-revealed? square))
+    (if (square-pressed? x y)
+	'pressed
+	'unknown)]
    [(square-mine? square) 'mine]
    [else (square-num-adjacent square)]))
 
+; preliminary
+(define (game-square-type-at game x y)
+  (square-type (game-square-at game x y) x y))
+
 (define (game-in-bounds? game x y)
   (and (< -1 x (game-width  game))
        (< -1 y (game-height game))))
@@ -531,6 +553,7 @@
 			       (length (filter square-mine? (game-around game x y))))) 
    game))
 
+
 ; as feared, make-vector references the same thing
 (define (new-game mines width height)
   (define squares (list->vector (append (make-squares mines #t)
@@ -540,7 +563,27 @@
   (fill-game-arounds! game)
   game)
 
-; ignoring revealed for now
+
+(define (game-tick! game)
+  (define mouse-x (car (square-mouse-over)))
+  (define mouse-y (cdr (square-mouse-over)))
+  (define mouse-in-bounds? (game-in-bounds? game mouse-x mouse-y))
+  (define mouse-square (and mouse-in-bounds? (game-square-at game mouse-x mouse-y)))
+  (define redraw?
+    (and mouse-in-bounds?
+	 (or (button-down? 'left)
+	     (button-down? 'middle)
+	     (button-down? 'right)
+					    
+	     (button-released? 'left)
+	     (button-released? 'middle)
+	     (button-released? 'right))))
+
+  ; not quite perfectly correct
+  (when (and mouse-in-bounds? (button-pressed? 'right))
+    (square-flagged?-set! mouse-square (not (square-flagged? mouse-square))))
+  redraw?)
+
 (define (draw-game-squares game skin pos)
   (game-squares-for-each
    (lambda (x y)
@@ -548,10 +591,6 @@
        (blit-square skin (game-square-type-at game x y) pos)))
    game))
 
-(define (square-mouse-over)
-  (cons (floor (/ (get-mouse-x) square-width))
-	(floor (/ (get-mouse-y) square-width))))
-
 (define (draw-write obj x y size color)
   (draw-text (with-output-to-string (lambda () (write obj)))
 	     x y size color))
@@ -587,19 +626,23 @@
 	    border-rects))
 
 (define (draw-mouse-info color)
-  (draw-write (square-mouse-over) 0 0 20 color)
+  (draw-write (square-mouse-over) 2 0 20 color)
 
-  (draw-write `(left down   . ,(button-down? 'left))   0 20 10 color)
-  (draw-write `(middle down . ,(button-down? 'middle)) 0 30 10 color)
-  (draw-write `(right down  . ,(button-down? 'right))  0 40 10 color)
+  (draw-write `(left down   . ,(button-down? 'left))   1 20 10 color)
+  (draw-write `(middle down . ,(button-down? 'middle)) 1 30 10 color)
+  (draw-write `(right down  . ,(button-down? 'right))  1 40 10 color)
 
-  (draw-write `(left pressed   . ,(button-pressed? 'left))   0 50 10 color)
-  (draw-write `(middle pressed . ,(button-pressed? 'middle)) 0 60 10 color)
-  (draw-write `(right pressed  . ,(button-pressed? 'right))  0 70 10 color)
+  (draw-write `(left pressed   . ,(button-pressed? 'left))   1 50 10 color)
+  (draw-write `(middle pressed . ,(button-pressed? 'middle)) 1 60 10 color)
+  (draw-write `(right pressed  . ,(button-pressed? 'right))  1 70 10 color)
 
-  (draw-write `(left released   . ,(button-released? 'left))   0 80  10 color)
-  (draw-write `(middle released . ,(button-released? 'middle)) 0 90  10 color)
-  (draw-write `(right released  . ,(button-released? 'right))  0 100 10 color))
+  (draw-write `(left released   . ,(button-released? 'left))   1 80  10 color)
+  (draw-write `(middle released . ,(button-released? 'middle)) 1 90  10 color)
+  (draw-write `(right released  . ,(button-released? 'right))  1 100 10 color))
+
+(define (game-draw game skin)
+  (draw-game-squares game skin (vector2 0 0)))
+; draw-game-over as a separate thing would be nice
 
 ; the game shows -99 when you (- num-mines num-flagged) is less than -99
 (define (run-game mines width height)
@@ -611,14 +654,21 @@
     ;; (display skin)
     ;; (newline)
 
+    (with-draw (game-draw game skin))
 ; with the actual game, we almost certainly don't have to redraw everything every time
 ; but we can afford it if laziness necessitates it
     (until (window-should-close?)
 	   (with-draw
-	    (draw-game-squares game skin (vector2 0 0))
-	    (draw-mouse-info WHITE)))
+	    ; this saves a lot of resources
+	    (when (game-tick! game)
+	      ; something leaks memory. huh!
+	      (clear-background BLACK)
+	      (game-draw game skin))
+	    #;(draw-mouse-info BLACK)
+	    ))
     (unload-texture skin)
     (close-window)))
 
-
 ; 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)