diff --git a/game/poker/card_example_test.go b/game/poker/card_example_test.go
index 8984c30..946f25b 100644
--- a/game/poker/card_example_test.go
+++ b/game/poker/card_example_test.go
@@ -12,3 +12,178 @@ func ExampleNewCard() {
 	// Output:
 	// (A Spade)
 }
+
+func ExampleCard_Equal() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card1.Equal(card2))
+
+	// Output:
+	// true
+}
+
+func ExampleCard_EqualColor() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.EqualColor(card2))
+
+	// Output:
+	// false
+}
+
+func ExampleCard_EqualPoint() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.EqualPoint(card2))
+
+	// Output:
+	// true
+}
+
+func ExampleCard_GetColor() {
+	card := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card.GetColor())
+
+	// Output:
+	// Spade
+}
+
+func ExampleCard_GetPoint() {
+	card := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card.GetPoint())
+
+	// Output:
+	// A
+}
+
+func ExampleCard_GetPointAndColor() {
+	card := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card.GetPointAndColor())
+
+	// Output:
+	// A Spade
+}
+
+func ExampleCard_MaxPoint() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.Point2, poker.ColorSpade)
+	fmt.Println(card1.MaxPoint(card2))
+
+	// Output:
+	// (2 Spade)
+}
+
+func ExampleCard_MinPoint() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.Point2, poker.ColorSpade)
+	fmt.Println(card1.MinPoint(card2))
+
+	// Output:
+	// (A Spade)
+}
+
+func ExampleCard_String() {
+	card := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card.String())
+
+	// Output:
+	// (A Spade)
+}
+
+func ExampleCard_MaxColor() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.MaxColor(card2))
+
+	// Output:
+	// (A Spade)
+}
+
+func ExampleCard_MinColor() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.MinColor(card2))
+
+	// Output:
+	// (A Heart)
+}
+
+func ExampleCard_Max() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.Max(card2))
+
+	// Output:
+	// (A Spade)
+}
+
+func ExampleCard_Min() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.Min(card2))
+
+	// Output:
+	// (A Heart)
+}
+
+func ExampleCard_IsJoker() {
+	card := poker.NewCard(poker.PointA, poker.ColorSpade)
+	fmt.Println(card.IsJoker())
+
+	// Output:
+	// false
+}
+
+func ExampleCard_CalcPointDifference() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.Point2, poker.ColorSpade)
+	fmt.Println(card1.CalcPointDifference(card2))
+
+	// Output:
+	// -1
+}
+
+func ExampleCard_CalcColorDifference() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.CalcColorDifference(card2))
+
+	// Output:
+	// 1
+}
+
+func ExampleCard_CalcPointDifferenceAbs() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.Point2, poker.ColorSpade)
+	fmt.Println(card1.CalcPointDifferenceAbs(card2))
+
+	// Output:
+	// 1
+}
+
+func ExampleCard_CalcColorDifferenceAbs() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.CalcColorDifferenceAbs(card2))
+
+	// Output:
+	// 1
+}
+
+func ExampleCard_IsNeighborPoint() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.Point2, poker.ColorSpade)
+	fmt.Println(card1.IsNeighborPoint(card2))
+
+	// Output:
+	// true
+}
+
+func ExampleCard_IsNeighborColor() {
+	card1 := poker.NewCard(poker.PointA, poker.ColorSpade)
+	card2 := poker.NewCard(poker.PointA, poker.ColorHeart)
+	fmt.Println(card1.IsNeighborColor(card2))
+
+	// Output:
+	// true
+}
diff --git a/game/poker/card_pile_example_test.go b/game/poker/card_pile_example_test.go
index e62ec97..5714397 100644
--- a/game/poker/card_pile_example_test.go
+++ b/game/poker/card_pile_example_test.go
@@ -13,5 +13,5 @@ func ExampleNewCardPile() {
 	fmt.Println(pile.Cards())
 
 	// Output:
-	// [(R None) (K Spade) (K Heart) (K Club) (K Diamond) (Q Spade) (Q Heart) (Q Club) (Q Diamond) (J Spade) (J Heart) (J Club) (J Diamond) (10 Spade) (10 Heart) (10 Club) (10 Diamond) (9 Spade) (9 Heart) (9 Club) (9 Diamond) (8 Spade) (8 Heart) (8 Club) (8 Diamond) (7 Spade) (7 Heart) (7 Club) (7 Diamond) (6 Spade) (6 Heart) (6 Club) (6 Diamond) (5 Spade) (5 Heart) (5 Club) (5 Diamond) (4 Spade) (4 Heart) (4 Club) (4 Diamond) (3 Spade) (3 Heart) (3 Club) (3 Diamond) (2 Spade) (2 Heart) (2 Club) (2 Diamond) (A Spade) (A Heart) (A Club) (A Diamond)]
+	// [(R None) (K Diamond) (K Club) (K Heart) (K Spade) (Q Diamond) (Q Club) (Q Heart) (Q Spade) (J Diamond) (J Club) (J Heart) (J Spade) (10 Diamond) (10 Club) (10 Heart) (10 Spade) (9 Diamond) (9 Club) (9 Heart) (9 Spade) (8 Diamond) (8 Club) (8 Heart) (8 Spade) (7 Diamond) (7 Club) (7 Heart) (7 Spade) (6 Diamond) (6 Club) (6 Heart) (6 Spade) (5 Diamond) (5 Club) (5 Heart) (5 Spade) (4 Diamond) (4 Club) (4 Heart) (4 Spade) (3 Diamond) (3 Club) (3 Heart) (3 Spade) (2 Diamond) (2 Club) (2 Heart) (2 Spade) (A Diamond) (A Club) (A Heart) (A Spade)]
 }
diff --git a/utils/maths/math_example_test.go b/utils/maths/math_example_test.go
new file mode 100644
index 0000000..8a6d1cb
--- /dev/null
+++ b/utils/maths/math_example_test.go
@@ -0,0 +1,18 @@
+package maths_test
+
+import (
+	"fmt"
+	"github.com/kercylan98/minotaur/utils/maths"
+)
+
+func ExampleToContinuous() {
+	var nums = []int{1, 2, 3, 5, 6, 7, 9, 10, 11}
+	var continuous = maths.ToContinuous(nums)
+
+	fmt.Println(nums)
+	fmt.Println(continuous)
+
+	// Output:
+	// [1 2 3 5 6 7 9 10 11]
+	// map[1:1 2:2 3:3 4:5 5:6 6:7 7:9 8:10 9:11]
+}