diff --git a/rectangular-region-mode.el b/rectangular-region-mode.el
new file mode 100644
index 0000000..7773c78
--- /dev/null
+++ b/rectangular-region-mode.el
@@ -0,0 +1,70 @@
+(require 'multiple-cursors-core)
+
+(defvar rrm/anchor (make-marker)
+  "The position in the buffer that anchors the rectangular region.")
+
+(defvar rectangular-region-mode-map (make-sparse-keymap)
+  "Keymap for rectangular region is mainly for rebinding C-g")
+
+(define-key rectangular-region-mode-map (kbd "C-g") 'rrm/keyboard-quit)
+
+(defun rrm/keyboard-quit ()
+  (interactive)
+  (rectangular-region-mode 0)
+  (rrm/remove-rectangular-region-overlays)
+  (deactivate-mark))
+
+;; Bind this to a key (for instance H-SPC) to start rectangular-region-mode
+(defun set-rectangular-region-anchor ()
+  (interactive)
+  (set-marker rrm/anchor (point))
+  (push-mark (point))
+  (rectangular-region-mode 1))
+
+(defun rrm/remove-rectangular-region-overlays ()
+  (mc/remove-fake-cursors)
+  (mapc #'(lambda (o)
+            (when (eq (overlay-get o 'type) 'additional-region)
+              (delete-overlay o)))
+        (overlays-in (point-min) (point-max))))
+
+(defun rrm/repaint ()
+  (rrm/remove-rectangular-region-overlays)
+  (let* ((annoying-arrows-mode nil)
+         (point-column (current-column))
+         (point-line (line-number-at-pos))
+         (anchor-column (save-excursion (goto-char rrm/anchor) (current-column)))
+         (anchor-line (save-excursion (goto-char rrm/anchor) (line-number-at-pos)))
+         (left-column (if (< point-column anchor-column) point-column anchor-column))
+         (right-column (if (> point-column anchor-column) point-column anchor-column))
+         (num-mirrors (abs (- point-line anchor-line)))
+         (num-chars (- right-column left-column))
+         (navigation-func (if (< point-line anchor-line) 'next-line 'previous-line)))
+    (move-to-column anchor-column t)
+    (set-mark (point))
+    (move-to-column point-column t)
+    (mc/save-excursion
+     (dotimes (i num-mirrors)
+       (funcall navigation-func)
+       (move-to-column right-column t)
+       (move-to-column anchor-column t)
+       (set-mark (point))
+       (move-to-column point-column t)
+       (mc/create-fake-cursor-at-point)))))
+
+(defun rrm/execute-change (&rest forms)
+  (rectangular-region-mode 0)
+  (multiple-cursors-mode 1))
+
+(define-minor-mode rectangular-region-mode
+  "A mode for creating a rectangular region to edit"
+  nil " rr" rectangular-region-mode-map
+  (if rectangular-region-mode
+      (progn
+        (add-hook 'after-change-functions 'rrm/execute-change t t)
+        (add-hook 'post-command-hook 'rrm/repaint t t))
+    (remove-hook 'after-change-functions 'rrm/execute-change t)
+    (remove-hook 'post-command-hook 'rrm/repaint t)
+    (set-marker rrm/anchor nil)))
+
+(provide 'rectangular-region-mode)
diff --git a/todo.org b/todo.org
index 45c8eca..0814503 100644
--- a/todo.org
+++ b/todo.org
@@ -1,21 +1,36 @@
-* TODO: [4/11]
-** DONE (set-marker MARKER nil) for performance
-** DONE C-g deactivates regions first, before disabling multiple-cursors
-** DONE more state to save per cursor: er/history
-** DONE refactor: an object with all the current state, used for both overlays and current
+* Ideas [1/5]
+** DONE rectangular-region-mode
+   Switch to a specialized multiple-cursors mode, anchoring it to the current
+   cursor position. Moving around increases/decreases the size/number of cursors,
+   to simulate vertical editing in textmate.
+** TODO Cycle through cursors
+   To scroll the buffer and watch all your cursors - make a keybinding for
+   promoting the next/previous fake cursor.
+** TODO Create replacements for common non-working commands
+   Possible to do C-s ... how about M-y ?
+   Any way to make M-z just prompt for letter once?
+** TODO mark-multiple-mode
+   mark-multiple has some advantages
+    -> simpler visuals, no extra cursors (matter of taste?)
+    -> moving out of the marked area quits the mode
+    -> yank-pop actually works
 ** TODO unknown command: Do for (a)ll, (o)nce or (i)gnore -> (did that work ok? (k)eep doing that or (d)on't)
    unknown-command ran once - what now? (o)nce is enough, repeat for (a)ll, (u)ndo - that did NOT work.
    unknown-command ran for all - did that work as expected? (y)es, (n)o
    what to do about unknown-command in the future? Run it (o)nce, or (s)top it from being run.
+* BUGS: [0/4]
+** TODO with multiple regions active, C-d deletes only a char in the fake ones
+** TODO there's something going wrong with last-command/this-command?
+   expand-region works nicely, even collapse when we save er/history, but last collapse puts all cursors in same spot
+** TODO clean up overlays when reverting buffer
+** TODO rectangular-region-mode fails when lines of the buffer have been hidden (ref collapse in org-mode)
+* TODO: [4/6]
+** DONE (set-marker MARKER nil) for performance
+** DONE C-g deactivates regions first, before disabling multiple-cursors
+** DONE more state to save per cursor: er/history
+** DONE refactor: an object with all the current state, used for both overlays and current
 ** TODO separate mark-multiple and multiple-cursors
    mark-multiple goes back to being the util? or just dies?
    given the problem with extract-var and undo, may just kill mark-multiple.
    problem with that is: C-g when doing rename-tag shouldn't go to multiple-cursors.
-** TODO clean up overlays when reverting buffer
 ** TODO add tests
-** TODO collapse cursors at same point (?)
-** TODO there's something going wrong with last-command/this-command?
-   expand-region works nicely, even collapse when we save er/history, but last collapse puts all cursors in same spot
-
-** TODO Create replacements for some common non-working commands
-   Possible to do C-s ... how about M-y ?