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diff --git a/super-bloom/common.scm b/super-bloom/common.scm
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+;;; Copyright 2023 David Thompson
+;;;
+;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;; you may not use this file except in compliance with the License.
+;;; You may obtain a copy of the License at
+;;;
+;;;    http://www.apache.org/licenses/LICENSE-2.0
+;;;
+;;; Unless required by applicable law or agreed to in writing, software
+;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;; See the License for the specific language governing permissions and
+;;; limitations under the License.
+
+(define-module (super-bloom common)
+  #:use-module (catbird asset)
+  #:use-module (chickadee)
+  #:use-module (chickadee audio)
+  #:use-module (chickadee graphics text)
+  #:use-module (oop goops)
+  #:export (%default-width
+            %default-height
+            %game-width
+            %game-height
+            %game-width:float
+            %game-height:float
+            scope-datadir
+            monogram-font
+            explosion-sound
+            absorb-sound
+            watered-sound
+            spray-sound
+            random:float
+            steps
+            water))
+
+(define %default-width 640)
+(define %default-height 480)
+(define %game-width 320)
+(define %game-height 240)
+(define %game-width:float (exact->inexact %game-width))
+(define %game-height:float (exact->inexact %game-height))
+
+(define (scope-datadir file-name)
+  (let ((prefix (or (getenv "SUPERBLOOM_DATADIR") (getcwd))))
+    (string-append prefix "/" file-name)))
+
+(define-asset (monogram-font (file (scope-datadir "assets/fonts/monogram_extended.ttf")))
+  (load-font file 12 #:smooth? #f))
+
+(define-asset (explosion-sound (file (scope-datadir "assets/audio/explosion.wav")))
+  (load-audio file))
+
+(define-asset (absorb-sound (file (scope-datadir "assets/audio/absorb.wav")))
+  (load-audio file))
+
+(define-asset (watered-sound (file (scope-datadir "assets/audio/watered.wav")))
+  (load-audio file))
+
+(define-asset (spray-sound (file (scope-datadir "assets/audio/spray.wav")))
+  (load-audio file))
+
+(define (random:float n)
+  (* (random:uniform) n))
+
+(define (steps n)
+  (* n (current-timestep)))
+
+(define-accessor water)