diff --git a/external_library/gem/toxiclibs/simulation/gray_scott_image.rb b/external_library/gem/toxiclibs/simulation/gray_scott_image.rb
index 8a6e4c6..90a2788 100644
--- a/external_library/gem/toxiclibs/simulation/gray_scott_image.rb
+++ b/external_library/gem/toxiclibs/simulation/gray_scott_image.rb
@@ -37,7 +37,7 @@
 class GrayScottToneImage < Propane::App
   attr_reader :gs, :tone_map, :img
 
-  KEYS = %w(1 2 3 4 5 6 7 8 9).freeze
+  KEYS = (1..9).map { |i| i }
 
   def setup
     sketch_title 'Gray Scott Image'
diff --git a/external_library/gem/toxiclibs/simulation/open_simplex_noise_test.rb b/external_library/gem/toxiclibs/simulation/open_simplex_noise_test.rb
new file mode 100644
index 0000000..9013fdb
--- /dev/null
+++ b/external_library/gem/toxiclibs/simulation/open_simplex_noise_test.rb
@@ -0,0 +1,52 @@
+#!/usr/bin/env jruby
+# frozen_string_literal: true
+require 'propane'
+# Test and SimplexNoise Karsten Schmidt
+# Better to use Built in OpenSimplex2 in propane
+class SimplexNoiseTest < Propane::App
+  attr_reader :noise_dimension, :noise_offset
+
+  NS = 0.06 # (try from 0.005 to 0.5)
+  KEYS = (1..4).map { |i| i.to_s }
+  def settings
+    size 300, 300, P2D
+  end
+
+  def setup
+    sketch_title 'Open Simplex Noise Test'
+    @noise_dimension = KEYS[0]
+    @noise_offset = 100
+    load_pixels
+  end
+
+  def draw
+    background 0
+    grid(width, height) do |i, j|
+      noise_val = 0
+      case(noise_dimension)
+      when KEYS[0]
+        noise_val = noise(i * NS + noise_offset, 0)
+      when KEYS[1]
+        noise_val = noise(i * NS + noise_offset, j * NS + noise_offset)
+      when KEYS[2]
+        noise_val = noise(i * NS + noise_offset, j * NS + noise_offset, frame_count * 0.01)
+      when KEYS[3]
+        noise_val = noise(i * NS + noise_offset, j * NS + noise_offset, 0, frame_count * 0.01)
+      else
+        noise_val = noise(i * NS + noise_offset, 0)
+      end
+      c = (noise_val * 127 + 128).to_i
+      # Fix required to return a java signed int
+      col = Java::Monkstone::ColorUtil.hex_long(c << 16 | c << 8 | c | 0xff000000)
+      pixels[j * width + i] = col # this is more efficient than set
+    end
+    update_pixels
+    @noise_offset += NS / 2
+  end
+
+  def key_pressed
+    @noise_dimension = key if KEYS.include? key
+  end
+end
+
+SimplexNoiseTest.new
diff --git a/external_library/gem/toxiclibs/simulation/simplex_noise_test.rb b/external_library/gem/toxiclibs/simulation/simplex_noise_test.rb
index 7cbc225..9ce237c 100644
--- a/external_library/gem/toxiclibs/simulation/simplex_noise_test.rb
+++ b/external_library/gem/toxiclibs/simulation/simplex_noise_test.rb
@@ -3,12 +3,12 @@
 require 'propane'
 require 'toxiclibs'
 # Test and SimplexNoise Karsten Schmidt
-# Better to use Built in OPenSimplex2 in propane
+# Better to use Built in OpenSimplex2 in propane
 class SimplexNoiseTest < Propane::App
   attr_reader :noise_dimension, :noise_offset
 
   NS = 0.06 # (try from 0.005 to 0.5)
-  KEYS = %w(1 2 3 4).freeze
+  KEYS = (1..4).map { |i| i.to_s }
   def settings
     size 300, 300, P2D
   end
@@ -22,26 +22,24 @@ def setup
 
   def draw
     background 0
-    (0...width).each do |i|
-      (0...height).each do |j|
-        noise_val = 0
-        case(noise_dimension)
-        when KEYS[0]
-          noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, 0)
-        when KEYS[1]
-          noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset)
-        when KEYS[2]
-          noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset, frame_count * 0.01)
-        when KEYS[3]
-          noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset, 0, frame_count * 0.01)
-        else
-          noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, 0)
-        end
-        c = (noise_val * 127 + 128).to_i
-        # Fix required to return a java signed int
-        col = Java::Monkstone::ColorUtil.hex_long(c << 16 | c << 8 | c | 0xff000000)
-        pixels[j * width + i] = col # this is more efficient than set
+    grid(width, height) do |i, j|
+      noise_val = 0
+      case(noise_dimension)
+      when KEYS[0]
+        noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, 0)
+      when KEYS[1]
+        noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset)
+      when KEYS[2]
+        noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset, frame_count * 0.01)
+      when KEYS[3]
+        noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, j * NS + noise_offset, 0, frame_count * 0.01)
+      else
+        noise_val = Toxi::SimplexNoise.noise(i * NS + noise_offset, 0)
       end
+      c = (noise_val * 127 + 128).to_i
+      # Fix required to return a java signed int
+      col = Java::Monkstone::ColorUtil.hex_long(c << 16 | c << 8 | c | 0xff000000)
+      pixels[j * width + i] = col # this is more efficient than set
     end
     update_pixels
     @noise_offset += NS / 2