diff --git a/src/engine.lisp b/src/engine.lisp
new file mode 100644
index 0000000..b27a285
--- /dev/null
+++ b/src/engine.lisp
@@ -0,0 +1,56 @@
+#-quicklisp
+(load (merge-pathnames "quicklisp/setup.lisp" (user-homedir-pathname)))
+
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (ql:quickload '(:cl-raylib :livesupport) :silent t)
+  #+sbcl (sb-int:set-floating-point-modes :traps nil))
+
+(defpackage #:engine
+  (:use #:cl)
+  (:local-nicknames (#:rl #:raylib)
+                    (#:v #:3d-vectors))
+  (:export #:main)
+  (:export #:run-game))
+
+(in-package #:engine)
+
+(defvar *game-state* nil)
+(defvar *game-config* nil)
+(defvar *texture-cache* (make-hash-table :test #'equal))
+;; (reset! texture-cache {})
+(defvar *buffered-objs* nil)
+
+(defun read-config (b))
+(defun snapshot (b))
+(defun restore (b))
+
+(defun run-game (&key (title "Untitled") (width 800) (height 600)
+                   config-path game-init game-update game-draw unload)
+  (if (rl:is-window-ready)
+      (warn "Existing raylib window open, ignoring!")
+      (progn
+        (rl:set-trace-log-level :log-warning)
+        (rl:with-window (width height title)
+          (rl:set-target-fps 30)
+          (setf *game-config* (when config-path (read-config config-path))
+                *game-state*  (funcall game-init))
+          (flet ((frame ()
+                   (livesupport:continuable
+                     (let ((new-state (funcall game-update *game-state*)))
+                       (rl:with-drawing (funcall game-draw new-state))
+                       (setf *game-state* new-state)))))
+            (loop until (rl:window-should-close) do
+              (dolist (b *buffered-objs*) (snapshot b))
+              (restart-case (frame)
+                (retry-frame () :report "Restore grid and re-run frame"
+                  (dolist (b *buffered-objs*) (restore b))
+                  (frame))
+                (skip-frame () :report "Restore grid and continue"
+                  (dolist (b *buffered-objs*) (restore b))))))
+          (loop for tex being the hash-values of *texture-cache*
+                do (rl:unload-texture tex))
+          (when unload (funcall unload *game-state*)))
+        (setf *buffered-objs* nil
+              *game-state*    nil
+              *game-config*   nil)
+        (clrhash *texture-cache*))))
diff --git a/src/game.lisp b/src/game.lisp
new file mode 100644
index 0000000..0b6df85
--- /dev/null
+++ b/src/game.lisp
@@ -0,0 +1,57 @@
+#-quicklisp
+(load (merge-pathnames "quicklisp/setup.lisp" (user-homedir-pathname)))
+(load (merge-pathnames "engine.lisp" *load-pathname*))
+
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (ql:quickload :cl-raylib :silent t)
+  #+sbcl (sb-int:set-floating-point-modes :traps nil))
+
+(defpackage #:game
+  (:use #:cl)
+  (:local-nicknames (#:rl #:raylib)
+                    (#:v #:3d-vectors)
+                    (#:e #:engine))
+  (:export #:main))
+
+(in-package #:game)
+
+(defconstant +screen-width+ 1400)
+(defconstant +screen-height+ 1000)
+(defconstant +cell-size+ 5)
+(defconstant +rows+ (floor +screen-height+ +cell-size+))
+(defconstant +cols+ (floor +screen-width+ +cell-size+))
+
+(defclass game ()
+  ((layers :initarg :layers :accessor layers)
+   (tilesets :initarg :tilesets :accessor tilesets)
+   (tilemaps :initarg :tilemaps :accessor tilemaps)
+   (current-layer :initarg :current-layer :accessor current-layer)
+   (current-tilemap :initarg :current-tilemap :accessor current-tilemap)
+   (selected-tile :initarg :selected-tile :accessor selected-tile)))
+
+(defun game-init ()
+  (make-instance 'game
+                 :layers '()
+                 :tilesets '()
+                 :tilemaps '()
+                 :current-layer 0
+                 :current-tilemap 0
+                 :selected-tile '(-1 -1 -1)))
+
+(defun game-update (state)
+  state)
+
+(defun game-draw (state)
+  (rl:clear-background :blue))
+
+(defun main ()
+  (e:run-game
+   :title "Game"
+   :width 1200
+   :height 1000
+   :game-init 'game-init
+   :game-update 'game-update
+   :game-draw 'game-draw
+   :unload (lambda (state))))
+
+(main)