I didn't see much of a difference with working in OOP in my opinion, it felt the same to me.

play.py

@@ -1,14 +1,34 @@
 from yahtzee import Yahtzee
 from yahtzee_goals import (
-    GoalOnes, 
+    GoalOnes,
-    GoalTwos, 
+    GoalTwos,
     GoalThrees,
+    GoalFours,
+    GoalFives,
+    GoalSixes,
+    GoalThreeOfAKind,
+    GoalFourOfAKind,
+    GoalFullHouse,
+    GoalSmallStraight,
+    GoalLargeStraight,
+    GoalYahtzee,
+    GoalChance,
 )
 
 goals = [
-    GoalOnes(), 
+    GoalOnes(),
     GoalTwos(),
     GoalThrees(),
+    GoalFours(),
+    GoalFives(),
+    GoalSixes(),
+    GoalThreeOfAKind(),
+    GoalFourOfAKind(),
+    GoalFullHouse(),
+    GoalSmallStraight(),
+    GoalLargeStraight(),
+    GoalYahtzee(),
+    GoalChance(),
 ]
 
 game = Yahtzee(goals)

yahtzee_goals.py

@@ -14,7 +14,6 @@ class GoalOnes:
         return total
 
 class GoalTwos:
-    "Two points for each two"
 
     def prompt(self, dice):
         potential_score = self.score(dice)
@@ -28,7 +27,6 @@ class GoalTwos:
         return total
 
 class GoalThrees:
-    "Three points for each three"
 
     def prompt(self, dice):
         potential_score = self.score(dice)
@@ -40,3 +38,143 @@ class GoalThrees:
             if die.face == 3:
                 total += 3
         return total
+
+class GoalFours:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Fours ({potential_score})"
+
+    def score(self, dice):
+        total = 0
+        for die in dice:
+            if die.face == 4:
+                total += 4
+        return total
+
+class GoalFives:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Fives ({potential_score})"
+
+    def score(self, dice):
+        total = 0
+        for die in dice:
+            if die.face == 5:
+                total += 5
+        return total
+
+class GoalSixes:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Sixes ({potential_score})"
+
+    def score(self, dice):
+        total = 0
+        for die in dice:
+            if die.face == 6:
+                total += 6
+        return total
+
+class GoalThreeOfAKind:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Three of a kind ({potential_score})"
+
+    def score(self, dice):
+        counts = {}
+        total = 0
+        for die in dice:
+            total += die.face
+            counts[die.face] = counts.get(die.face, 0) + 1
+        for c in counts.values():
+            if c >= 3:
+                return total
+        return 0
+
+class GoalFourOfAKind:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Four of a kind ({potential_score})"
+
+    def score(self, dice):
+        counts = {}
+        total = 0
+        for die in dice:
+            total += die.face
+            counts[die.face] = counts.get(die.face, 0) + 1
+        for c in counts.values():
+            if c >= 4:
+                return total
+        return 0
+
+class GoalFullHouse:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Full House ({potential_score})"
+
+    def score(self, dice):
+        counts = {}
+        for die in dice:
+            counts[die.face] = counts.get(die.face, 0) + 1
+        values = sorted(counts.values())
+        if values == [2, 3]:
+            return 25
+        return 0
+
+class GoalSmallStraight:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Small Straight ({potential_score})"
+
+    def score(self, dice):
+        faces = sorted({die.face for die in dice})
+        # check for sequences of length 4: 1-4, 2-5, 3-6
+        sequences = [list(range(start, start + 4)) for start in (1, 2, 3)]
+        for seq in sequences:
+            if all(num in faces for num in seq):
+                return 30
+        return 0
+
+class GoalLargeStraight:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Large Straight ({potential_score})"
+
+    def score(self, dice):
+        faces = sorted({die.face for die in dice})
+        if faces == [1, 2, 3, 4, 5] or faces == [2, 3, 4, 5, 6]:
+            return 40
+        return 0
+
+class GoalYahtzee:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Yahtzee ({potential_score})"
+
+    def score(self, dice):
+        first = dice[0].face
+        for die in dice:
+            if die.face != first:
+                return 0
+        return 50
+
+class GoalChance:
+
+    def prompt(self, dice):
+        potential_score = self.score(dice)
+        return f"Chance ({potential_score})"
+
+    def score(self, dice):
+        total = 0
+        for die in dice:
+            total += die.face
+        return total