diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md
index 8169a48..c5635fd 100644
--- a/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md	
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md	
@@ -82,6 +82,15 @@
 
 ### 상태(State) 패턴
 
+#### 구현 요구사항
+
+- 상태별로 다르게 움직이는 게임 캐릭터를 구현한다.
+    - 기본적으로 게임 캐릭터는 정지상태이다.
+    - 정지 상태에서 버튼을 누르면 이동한다.
+    - 이동하는 상태에서 버튼을 누르면 점프한다.
+    - 점프하는 상태에서 버튼을 누르면 착지한 뒤 정지한다.
+    - 게임 캐릭터는 버튼을 누르면 동작하는 상태로 스스로의 상태를 변경한다.
+
 ### 데코레이터(Decorator) 패턴
 
 ### 프록시(Proxy) 패턴
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt
new file mode 100644
index 0000000..e76424f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacter.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class GameCharacter(
+    private var state: State = StoppingState()
+) {
+    fun move() {
+        state.move(this)
+    }
+
+    fun changeState(newState: State) {
+        this.state = newState
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt
new file mode 100644
index 0000000..a117167
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/GameCharacterApplication.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class GameCharacterApplicationAfter
+
+fun main() {
+    val gameCharacter = GameCharacter()
+    gameCharacter.move()
+    gameCharacter.move()
+    gameCharacter.move()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt
new file mode 100644
index 0000000..161b57f
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/State.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+interface State {
+    fun move(gameCharacter: GameCharacter)
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt
new file mode 100644
index 0000000..1108b77
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/after/States.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.after
+
+class StoppingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 이동한다.")
+        gameCharacter.changeState(MovingState())
+    }
+}
+
+class MovingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 점프한다.")
+        gameCharacter.changeState(JumpingState())
+    }
+}
+
+class JumpingState : State {
+    override fun move(gameCharacter: GameCharacter) {
+        println("캐릭터가 착지한 뒤 정지한다.")
+        gameCharacter.changeState(StoppingState())
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt
new file mode 100644
index 0000000..d3a2370
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacter.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+class GameCharacter(
+    private var state: State = State.STOPPING
+) {
+    fun move() {
+        when (state) {
+            State.STOPPING -> {
+                println("캐릭터가 이동한다.")
+                this.state = State.MOVING
+            }
+            State.MOVING -> {
+                println("캐릭터가 점프한다.")
+                this.state = State.JUMPING
+            }
+            State.JUMPING -> {
+                println("캐릭터가 착지한 뒤 정지한다.")
+                this.state = State.STOPPING
+            }
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt
new file mode 100644
index 0000000..629df44
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/GameCharacterApplication.kt	
@@ -0,0 +1,10 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+class GameCharacterApplicationBefore
+
+fun main() {
+    val gameCharacter = GameCharacter()
+    gameCharacter.move()
+    gameCharacter.move()
+    gameCharacter.move()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt
new file mode 100644
index 0000000..9eb021c
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/state/before/State.kt	
@@ -0,0 +1,7 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.state.before
+
+enum class State {
+    STOPPING,
+    MOVING,
+    JUMPING,
+}