diff --git a/src/propeller/problems/UBall5D.cljc b/src/propeller/problems/UBall5D.cljc
new file mode 100644
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+++ b/src/propeller/problems/UBall5D.cljc
@@ -0,0 +1,128 @@
+(ns propeller.problems.UBall5D
+  (:require [propeller.genome :as genome]
+            [propeller.push.interpreter :as interpreter]
+            [propeller.push.state :as state]
+            [propeller.tools.math :as math]
+            [propeller.gp :as gp]
+            #?(:cljs [cljs.reader :refer [read-string]])))
+
+(defn- target-function
+  "Target function: f(x) = 10/(5 + SUM_i=1^5 (x_i - 3)^2)"
+  [x1 x2 x3 x4 x5]
+  (->> (list x1 x2 x3 x4 x5)
+       (map #(* (- % 3) (- % 3)))
+       (apply +)
+       (+ 5)
+       (/ 10)))
+
+(target-function 3 7 3 3 3)
+
+(defn map-vals-input
+  "Returns all the input values of a map"
+  [i]
+  (vals (select-keys i [:input1 :input2 :input3 :input4 :input5])))
+
+
+(defn get-random-input
+  "returns a random input between two ranges"
+  [a b]
+  (->> (rand)
+       (* (- b a))
+       (+ a)
+       (float)))
+
+(def train-data
+  (repeatedly 1024 (fn [] (repeatedly 5 #(get-random-input 0.05 6.05)))))
+
+(def test-data
+  (repeatedly 5000 (fn [] (repeatedly 5 #(get-random-input -0.25 6.35)))))
+
+(def train-and-test-data
+  (let [train-inputs train-data
+        test-inputs test-data]
+    {:train (map (fn [x] {:input1 (first x)
+                          :input2 (nth x 1)
+                          :input3 (nth x 2)
+                          :input4 (nth x 3)
+                          :input5 (nth x 4)
+                          :output1 (apply target-function (map #(nth x %) (range 5)))}) train-inputs)
+     :test (map (fn [x] {:input1 (first x)
+                          :input2 (nth x 1)
+                          :input3 (nth x 2)
+                          :input4 (nth x 3)
+                          :input5 (nth x 4)
+                          :output1 (apply target-function (map #(nth x %) (range 5)))}) test-inputs)}))
+
+(def instructions 
+  (list :in1
+        :in2
+        :in3
+        :in4
+        :in5
+        :float_add
+        :float_subtract
+        :float_mult
+        :float_quot
+        :float_eq
+        :exec_dup
+        :exec_if
+        'close
+        0.0
+        1.0))
+
+(def data (:train train-and-test-data))
+
+(defn error-function
+  "Finds the behaviors and errors of an individual. The error is the absolute
+  deviation between the target output value and the program's selected behavior,
+  or 1000000 if no behavior is produced. The behavior is here defined as the
+  final top item on the FLOAT stack."
+  ([argmap data individual]
+   (let [program (genome/plushy->push (:plushy individual) argmap)
+         inputs (map (fn [i] (map-vals-input i)) data)
+         correct-outputs (map (fn [x] (:output1 x)) data)
+         outputs (map (fn [input]
+                        (state/peek-stack
+                          (interpreter/interpret-program
+                            program
+                            (assoc state/empty-state :input {:in1 (nth input 0)
+                                                          :in2 (nth input 1)
+                                                          :in3 (nth input 2)
+                                                          :in4 (nth input 3)
+                                                          :in5 (nth input 4)})
+                            (:step-limit argmap))
+                          :float))
+                      inputs)
+         errors (map (fn [correct-output output]
+                       (if (= output :no-stack-item)
+                         1000000
+                         (math/abs (- correct-output output))))
+                     correct-outputs
+                     outputs)]
+     (assoc individual
+       :behaviors outputs
+       :errors errors
+       :total-error #?(:clj  (apply +' errors)
+                       :cljs (apply + errors))))))
+
+(defn -main
+  "Runs propel-gp, giving it a map of arguments."
+  [& args]
+  (gp/gp
+    (merge
+      {:instructions             instructions
+       :error-function           error-function
+       :training-data            (:train train-and-test-data)
+       :testing-data             (:test train-and-test-data)
+       :max-generations          300
+       :population-size          1000
+       :max-initial-plushy-size  100
+       :step-limit               200
+       :parent-selection         :lexicase
+       :tournament-size          5
+       :umad-rate                0.1
+       :solution-error-threshold  0.1
+       :variation                {:umad 1.0 :crossover 0.0}
+       :elitism                  false}
+      (apply hash-map (map #(if (string? %) (read-string %) %) args))))
+  (#?(:clj shutdown-agents)))