diff --git a/src/propeller/problems/PSB2/camel_case.cljc b/src/propeller/problems/PSB2/camel_case.cljc
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+++ b/src/propeller/problems/PSB2/camel_case.cljc
@@ -0,0 +1,98 @@
+(ns propeller.problems.PSB2.camel-case
+  (:require [psb2.core :as psb2]
+            [propeller.genome :as genome]
+            [propeller.push.interpreter :as interpreter]
+            [propeller.utils :as utils]
+            [propeller.push.utils.helpers :refer [get-stack-instructions]]
+            [propeller.push.state :as state]
+            [propeller.tools.math :as math]
+            [propeller.tools.metrics :as metrics]))
+
+; ===========  PROBLEM DESCRIPTION  =====================================
+; CAMEL CASE from PSB2
+; Take a string in kebab-case and convert all of the words to camelCase.
+; Each group of words to convert is delimited by "-", and each grouping
+; is separated by a space. For example: "camel-case example-test-string"
+; → "camelCase exampleTestString"
+;
+; Source: https://arxiv.org/pdf/2106.06086.pdf
+; =======================================================================
+
+; Visible character ERC
+(defn random-char
+  []
+  (rand-nth (map char (range 97 122))))
+
+; Word generator for string ERC
+(defn word-generator
+  []
+  (let [chars-between #(map char (range (int %1) (inc (int %2))))
+        chars (chars-between \a \z)
+        word-len (inc (rand-int 5))]
+    (apply str (repeatedly word-len #(rand-nth chars)))))
+
+(defn cleanup-length
+  [string len]
+  (let [result (take len string)]
+    (if (or (= (last result) \space)
+            (= (last result) \-))
+      (apply str (butlast result))
+      (apply str result))))
+
+; String ERC
+(defn random-input
+  [len]
+  (loop [result-string (word-generator)]
+    (if (>= (count result-string) len)
+      (cleanup-length result-string len)
+      (recur (str result-string
+                  (if (< (rand) 0.66) \- \space)
+                  (word-generator))))))
+
+(def instructions
+  (utils/not-lazy
+    (concat
+      ;;; stack-specific instructions
+      (get-stack-instructions #{:exec :integer :boolean :char :string :print})
+      ;;; input instructions
+      (list :in1)
+      ;;; close
+      (list 'close)
+      ;;; ERCs (constants)
+      (list \- \space random-char (fn [] (random-input 21))))))
+
+
+(defn error-function
+  ([argmap individual]
+   (error-function argmap individual :train))
+  ([argmap individual subset]
+   (let [program (genome/plushy->push (:plushy individual) argmap)
+         data (get (get argmap :train-and-test-data) subset)
+         inputs (map (fn [i] (get i :input1)) data)
+         correct-outputs (map (fn [i] (get i :output1)) data)
+         outputs (map (fn [input]
+                        (state/peek-stack
+                          (interpreter/interpret-program
+                            program
+                            (assoc state/empty-state :input {:in1 input})
+                            (:step-limit argmap))
+                          :string))
+                      inputs)
+         parsed-outputs (map (fn [output]
+                               (try (read-string output)
+                                    #?(:clj (catch Exception e 1000.0)
+                                       :cljs (catch js/Error. e 1000.0))))
+                             outputs)
+         errors (map (fn [correct-output output]
+                       (if (= output :no-stack-item)
+                         10000
+                         (metrics/levenshtein-distance correct-output output)))
+                     correct-outputs
+                     parsed-outputs)]
+     (assoc individual
+       :behaviors parsed-outputs
+       :errors errors
+       :total-error #?(:clj  (apply +' errors)
+                       :cljs (apply + errors))))))
+
+