diff --git a/.gitignore b/.gitignore
index 91dfed8..e6b1219 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .DS_Store
-node_modules
\ No newline at end of file
+node_modules
+js/
\ No newline at end of file
diff --git a/game.html b/game.html
index a8c9a21..9f88c10 100644
--- a/game.html
+++ b/game.html
@@ -68,11 +68,8 @@
         <a href="https://www.flaticon.com/free-icons/processor" title="processor icons">Processor icons created by kerismaker - Flaticon</a>
     </div> -->
 
-    
     <script type="module">
-        import {main, btnHigherClick, btnLowerClick} from "./game.js"
-        window.btnHigherClick = btnHigherClick
-        window.btnLowerClick = btnLowerClick
+        import { main } from "./js/game.js"
         main()
     </script>
 </body>
diff --git a/game.js b/game.js
deleted file mode 100644
index bcaee6c..0000000
--- a/game.js
+++ /dev/null
@@ -1,115 +0,0 @@
-import { CountUp } from "https://cdnjs.cloudflare.com/ajax/libs/countup.js/2.6.0/countUp.min.js";
-
-var cpuList;
-var currentCpu;
-var nextCpu;
-
-// current user score
-var score;
-var highScore;
-
-function setHighScore(score) {
-    const currHighScore = localStorage.getItem("highScore_cpu")
-    if (currHighScore < score) {
-        localStorage.setItem("highScore_cpu", score)
-        highScore = score
-    }
-}
-
-export async function main() {
-    await (fetch('./data.json')
-        .then((response) => response.json())
-        .then((json) => cpuList = json));
-
-    currentCpu = getRandomCpu();
-    nextCpu = getRandomCpu();
-    score = 0;
-    highScore = localStorage.getItem("highScore_cpu") ?? 0
-    updateLayout();
-}
-
-function getRandomCpu() {
-    let randomIndex = getRandomInt(0, cpuList.length)
-    return {
-        name: cpuList[randomIndex]["name"].split('@')[0],
-        score: cpuList[randomIndex]["cpuScore"]
-    }
-}
-
-export function btnLowerClick() {
-    nextCpu.score < currentCpu.score ? showResult(true) : showResult(false);
-}
-
-export function btnHigherClick() {
-    nextCpu.score > currentCpu.score ? showResult(true) : showResult(false);
-}
-
-function showResult(isCorrect) {
-    document.getElementById("btnHigher").setAttribute("disabled", "");
-    document.getElementById("btnLower").setAttribute("disabled", "");
-
-    document.getElementById("col2").style.backgroundColor = isCorrect ? "lightgreen" : "#FF4444";
-    if (!isCorrect) {
-        setHighScore(score)
-    }
-    score = isCorrect ? score + 1 : 0;
-    if (score > highScore) {
-        highScore = score;
-        document.getElementById("highScore").innerText = highScore;
-    }
-    document.getElementById("score").innerText = score;
-
-    countUp();
-}
-
-// updates view based on the cpu objects
-function updateLayout() {
-    document.getElementById("highScore").innerText = highScore;
-
-    document.getElementById("currentCpuTitle").innerText = currentCpu.name;
-    // add "." to large numbers
-    document.getElementById("currentCpuScore").innerText = new Intl.NumberFormat().format(currentCpu.score)
-    document.getElementById("nextCpuTitle").innerText = nextCpu.name;
-    
-    document.getElementById("nextCpuScore").innerText = "?";
-
-    document.getElementById("col2").style.backgroundColor = "";
-}
-
-function delay(time) {
-    return new Promise(resolve => setTimeout(resolve, time));
-}
-
-async function countUp() {
-    const options = {
-        startVal: nextCpu.score / 2,
-        separator: '.',
-        decimal: ',',
-        duration: 2
-    };
-    let counter = new CountUp('nextCpuScore', nextCpu.score, options);
-    if (!counter.error) {
-        counter.start();
-    } else {
-        counter.error(demo.error);
-    }
-
-    await delay(2500)
-    nextRound();
-
-    document.getElementById("btnHigher").removeAttribute("disabled");
-    document.getElementById("btnLower").removeAttribute("disabled");
-}
-
-function nextRound() {
-    currentCpu = nextCpu;
-    nextCpu = getRandomCpu();
-
-    updateLayout();
-}
-
-function getRandomInt(min, max) {
-    min = Math.ceil(min);
-    max = Math.floor(max);
-    return Math.floor(Math.random() * (max - min) + min); // The maximum is exclusive and the minimum is inclusive
-}
\ No newline at end of file
diff --git a/gst.html b/gst.html
index d8c42f6..742a0ba 100644
--- a/gst.html
+++ b/gst.html
@@ -32,7 +32,7 @@
                     </li>
                     <li class="nav-item">
                         <a class="nav-link" href="about.html">About</a>
-                    </li>    
+                    </li>  
                 </ul>
               </div>
             </div>
@@ -68,8 +68,7 @@
     </div>
 
     <script type="module">
-        import {main, btnClick} from "./gst.js"
-        window.btnClick = btnClick
+        import { main } from "./js/gst.js"
         main()
     </script>
 </body>
diff --git a/gst.js b/gst.js
deleted file mode 100644
index 61ebc0c..0000000
--- a/gst.js
+++ /dev/null
@@ -1,124 +0,0 @@
-var cpuList;
-var currentCpu;
-
-var score;
-var highScore;
-
-export async function main() {
-    // init cpu list
-    await (fetch('./data.json')
-        .then((response) => response.json())
-        .then((json) => cpuList = json));
-
-    highScore = localStorage.getItem("highScore_socket") ?? 0
-    score = 0;
-    updateScores();
-
-    nextRound();
-}
-
-function nextRound() {
-    currentCpu = getRandomCpu();
-
-    document.getElementById("cpuName").innerText = currentCpu.name;
-
-    document.getElementById("mainCol").style.backgroundColor = "";
-}
-
-function getRandomCpu() {
-    let randomIndex;
-    do {
-        randomIndex = getRandomInt(0, cpuList.length)
-    } while (typeof(cpuList[randomIndex]["type"]) == null || cpuList[randomIndex]["type"] == "null" || cpuList[randomIndex]["type"] == null);
-    
-    
-    return {
-        name: cpuList[randomIndex]["name"].split('@')[0],
-        type: cpuList[randomIndex]["type"]
-    }
-}
-
-function delay(time) {
-    return new Promise(resolve => setTimeout(resolve, time));
-}
-
-export async function btnClick(typ) {
-    // 0 -> Desktop
-    // 1 -> Laptop
-    // 2 -> Mobile/Embedded
-    // 3 -> Server
-
-    let btnDesktop =  document.getElementById("btnDesktop");
-    let btnLaptop =  document.getElementById("btnLaptop");
-    let btnMobile =  document.getElementById("btnMobile");
-    let btnServer =  document.getElementById("btnServer");
-
-    let btns = [btnDesktop, btnLaptop, btnMobile, btnServer];
-
-    btns.forEach((el) => {
-        el.setAttribute("disabled", "");
-    })
-
-    switch (typ) {
-        case 0:
-            btnDesktop.style.backgroundColor = "#FF4444";
-            break;
-        case 1:
-            btnLaptop.style.backgroundColor = "#FF4444";
-            break;
-        case 2:
-            btnMobile.style.backgroundColor = "#FF4444";
-            break;
-        case 3:
-            btnServer.style.backgroundColor = "#FF4444";
-            break;
-    }
-
-    if(currentCpu.type.includes("Desktop")) {
-        btnDesktop.style.backgroundColor = "lightgreen";
-    } 
-    if(currentCpu.type.includes("Laptop")) {
-        btnLaptop.style.backgroundColor = "lightgreen";
-    } 
-    if(currentCpu.type.includes("Mobile/Embedded")) {
-        btnMobile.style.backgroundColor = "lightgreen";
-    }
-    if(currentCpu.type.includes("Server")) {
-        btnServer.style.backgroundColor = "lightgreen";
-    }
-
-    // Score
-    if (btns[typ].style.backgroundColor == "lightgreen") {
-        score++;
-    } else {
-        score = 0;
-    }
-    // Highscore
-    if (score > highScore) {
-        highScore = score;
-        localStorage.setItem("highScore_socket", highScore);
-    }
-    updateScores();
-
-    await delay(1000);
-
-    btns.forEach( (el) => {
-        el.style.backgroundColor = "#3CC3FA";
-        el.removeAttribute("disabled");
-    })
-
-    nextRound();
-}
-
-function updateScores() {
-    document.getElementById("score").innerText = score;
-    document.getElementById("highScore").innerText = highScore;
-}
-
-function getRandomInt(min, max) {
-    min = Math.ceil(min);
-    max = Math.floor(max);
-    return Math.floor(Math.random() * (max - min) + min); // The maximum is exclusive and the minimum is inclusive
-}
-
-main();
\ No newline at end of file
diff --git a/src/cpuRepository.ts b/src/cpuRepository.ts
new file mode 100644
index 0000000..2d4eb7f
--- /dev/null
+++ b/src/cpuRepository.ts
@@ -0,0 +1,46 @@
+export class CpuRepository {
+    #cpuList;
+
+    #currentCPU;
+    #nextCPU;
+
+    async init() {
+        const fetchResult = await fetch("../data.json");
+        this.#cpuList = await fetchResult.json();
+
+        this.reset();
+    }
+
+    get currentCpu() {
+        return this.#currentCPU;
+    }
+
+    get nextCpu() {
+        return this.#nextCPU;
+    }
+
+    getRandomCpu() {
+        let randomIndex: number;
+        do {
+            randomIndex = this.#getRandomInt(0, this.#cpuList.length);
+        } while (this.#cpuList[randomIndex]["value"] == null || this.#cpuList[randomIndex]["type"] == null)
+        this.#cpuList[randomIndex]["name"] = this.#cpuList[randomIndex]["name"].split('@')[0];
+        return this.#cpuList[randomIndex];
+    }
+
+    #getRandomInt(min, max): number {
+        min = Math.ceil(min);
+        max = Math.floor(max);
+        return Math.floor(Math.random() * (max - min) + min); // The maximum is exclusive and the minimum is inclusive
+    }
+
+    nextRound(): void {
+        this.#currentCPU = this.#nextCPU
+        this.#nextCPU = this.getRandomCpu();
+    }
+
+    reset(): void {
+        this.#currentCPU = this.getRandomCpu();
+        this.#nextCPU = this.getRandomCpu();
+    }
+}
\ No newline at end of file
diff --git a/src/game.ts b/src/game.ts
new file mode 100644
index 0000000..5ca8743
--- /dev/null
+++ b/src/game.ts
@@ -0,0 +1,168 @@
+// @ts-ignore
+import { CountUp } from "https://cdnjs.cloudflare.com/ajax/libs/countup.js/2.6.0/countUp.min.js";
+import { Stats } from "./statistics.js";
+import { CpuRepository } from "./cpuRepository.js"
+
+class UI {
+    #model: ViewModel;
+
+    #btnLower: HTMLElement;
+    #btnHigher: HTMLElement;
+    #btnScore: HTMLElement;
+    #btnHighScore: HTMLElement;
+
+    #curCpuTitle: HTMLElement;
+    #curCpuScore: HTMLElement;
+    #nextCpuTitle: HTMLElement;
+    #nextCpuScore: HTMLElement;
+
+    #background: HTMLElement;
+    
+    constructor() {
+        this.#model = new ViewModel();
+    }
+
+    async init() {
+        await this.#model.init();
+
+        this.#btnLower = document.getElementById("btnLower");
+        this.#btnHigher = document.getElementById("btnHigher");
+        this.#btnScore = document.getElementById("score");
+        this.#btnHighScore = document.getElementById("highScore");
+
+        this.#curCpuTitle = document.getElementById("currentCpuTitle");
+        this.#curCpuScore = document.getElementById("currentCpuScore");
+        this.#nextCpuTitle = document.getElementById("nextCpuTitle");
+        this.#nextCpuScore = document.getElementById("nextCpuScore");
+
+        this.#background = document.getElementById("col2");
+
+        this.#btnLower.onclick = () => this.handleButtonLowerClick();
+        this.#btnHigher.onclick = () => this.handleButtonHigherClick();
+
+        this.updateLayout();
+    }
+
+    updateLayout() {
+        this.#btnHighScore.innerText = this.#model.highScore.toString();
+
+        this.#curCpuTitle.innerText = this.#model.currentCpu.name;
+        // add "." to large numbers
+        this.#curCpuScore.innerText = new Intl.NumberFormat().format(this.#model.currentCpu.cpuScore);
+        this.#nextCpuTitle.innerText = this.#model.nextCpu.name;
+        
+        this.#nextCpuScore.innerText = "?";
+    
+        this.#background.style.backgroundColor = "";
+    }
+
+    handleButtonLowerClick() {
+        let result = this.#model.buttonClicked("lower");
+        this.#showResult(result);
+    }
+
+    handleButtonHigherClick() {
+        let result = this.#model.buttonClicked("higher");
+        this.#showResult(result);
+    }
+
+    #showResult(isCorrect) {
+        this.#btnHigher.setAttribute("disabled", "");
+        this.#btnLower.setAttribute("disabled", "");
+    
+        this.#background.style.backgroundColor = isCorrect ? "lightgreen" : "#FF4444";
+        
+        isCorrect ? this.#model.incrementScore() : this.#model.resetScore();
+        
+        this.#btnHighScore.innerText = this.#model.highScore.toString();
+        this.#btnScore.innerText = this.#model.score.toString();
+    
+        this.#countUp();
+    }
+
+    #delay(time) {
+        return new Promise(resolve => setTimeout(resolve, time));
+    }
+    
+    async #countUp() {
+        const options = {
+            startVal: this.#model.nextCpu.cpuScore / 2,
+            separator: '.',
+            decimal: ',',
+            duration: 2
+        };
+        let counter = new CountUp('nextCpuScore', this.#model.nextCpu.cpuScore, options);
+        if (!counter.error) {
+            counter.start();
+        } else {
+            console.log(counter.error);
+        }
+    
+        await this.#delay(2500)
+        this.#model.nextRound();
+    
+        this.#btnHigher.removeAttribute("disabled");
+        this.#btnLower.removeAttribute("disabled");
+
+        this.updateLayout();
+    }
+}
+
+class ViewModel {
+    #repo: CpuRepository;
+    #localStats: Stats;
+    
+    constructor() {
+        this.#repo = new CpuRepository();
+        this.#localStats = new Stats("highScore_cpu");
+    }
+
+    async init() {
+        await this.#repo.init();
+    }
+
+    nextRound(): void {
+        this.#repo.nextRound();
+    }
+
+    // "lower" and "higher"
+    buttonClicked(value: string): boolean {
+        if (value == "higher") {
+            return this.#repo.nextCpu.cpuScore > this.#repo.currentCpu.cpuScore;
+        }
+        if (value == "lower") {
+            return this.#repo.nextCpu.cpuScore < this.#repo.currentCpu.cpuScore;
+        }
+        console.log("nothing found for '" + value + "'");
+        return false;
+    }
+
+    incrementScore() {
+        this.#localStats.incrementScore();
+    }
+
+    resetScore() {
+        this.#localStats.resetScore();
+    }
+
+    get currentCpu() {
+        return this.#repo.currentCpu;
+    }
+
+    get nextCpu() {
+        return this.#repo.nextCpu;
+    }
+
+    get highScore() {
+        return this.#localStats.highScore;
+    }
+
+    get score() {
+        return this.#localStats.score;
+    }
+}
+
+export async function main() {
+    const ui = new UI();
+    await ui.init();
+}
\ No newline at end of file
diff --git a/src/gst.ts b/src/gst.ts
new file mode 100644
index 0000000..f57ecae
--- /dev/null
+++ b/src/gst.ts
@@ -0,0 +1,166 @@
+import { CpuRepository } from "./cpuRepository.js";
+import { Stats } from "./statistics.js";
+
+type CPU = {
+    name: string;
+    type: string;
+}
+
+class UI {
+    #model: ViewModel;
+
+    #btnDesktop: HTMLElement;
+    #btnLaptop: HTMLElement;
+    #btnServer: HTMLElement;
+    #btnMobile: HTMLElement;
+
+    #btns: HTMLElement[];
+
+    #cpuName: HTMLElement;
+    #score: HTMLElement;
+    #highScore: HTMLElement;
+    #mainCol: HTMLElement;
+
+    constructor() {
+        this.#model = new ViewModel();
+
+        this.#btnDesktop =  document.getElementById("btnDesktop");
+        this.#btnDesktop.onclick = () => this.btnClick(0);
+        this.#btnLaptop =  document.getElementById("btnLaptop");
+        this.#btnLaptop.onclick = () => this.btnClick(1);
+        this.#btnMobile =  document.getElementById("btnMobile");
+        this.#btnMobile.onclick = () => this.btnClick(2);
+        this.#btnServer =  document.getElementById("btnServer");
+        this.#btnServer.onclick = () => this.btnClick(3);
+
+        this.#btns = [this.#btnDesktop, this.#btnLaptop, this.#btnMobile, this.#btnServer];
+
+        this.#cpuName = document.getElementById("cpuName");
+        this.#score = document.getElementById("score");
+        this.#highScore = document.getElementById("highScore");
+        this.#mainCol = document.getElementById("mainCol");
+    }
+
+    async init() {
+        await this.#model.init();
+
+        this.#nextRound();
+    }
+
+    #updateScores() {
+        this.#score.innerText = this.#model.score.toString();
+        this.#highScore.innerText = this.#model.highScore.toString();
+    }
+
+    async #delay(time) {
+        return new Promise(resolve => setTimeout(resolve, time));
+    }
+
+    #nextRound() {
+        this.#model.nextRound();
+
+        this.#cpuName.innerText = this.#model.currentCpu.name;
+
+        this.#mainCol.style.backgroundColor = "";
+    }
+
+    async btnClick(typ) {
+        // 0 -> Desktop
+        // 1 -> Laptop
+        // 2 -> Mobile/Embedded
+        // 3 -> Server
+    
+        this.#btns.forEach((el) => {
+            el.setAttribute("disabled", "");
+        })
+    
+        switch (typ) {
+            case 0:
+                this.#btnDesktop.style.backgroundColor = "#FF4444";
+                break;
+            case 1:
+                this.#btnLaptop.style.backgroundColor = "#FF4444";
+                break;
+            case 2:
+                this.#btnMobile.style.backgroundColor = "#FF4444";
+                break;
+            case 3:
+                this.#btnServer.style.backgroundColor = "#FF4444";
+                break;
+        }
+    
+        const currentType = this.#model.currentCpu.type;
+        if(currentType.includes("Desktop")) {
+            this.#btnDesktop.style.backgroundColor = "lightgreen";
+        } 
+        if(currentType.includes("Laptop")) {
+            this.#btnLaptop.style.backgroundColor = "lightgreen";
+        } 
+        if(currentType.includes("Mobile/Embedded")) {
+            this.#btnMobile.style.backgroundColor = "lightgreen";
+        }
+        if(currentType.includes("Server")) {
+            this.#btnServer.style.backgroundColor = "lightgreen";
+        }
+    
+        // Score
+        if (this.#btns[typ].style.backgroundColor == "lightgreen") {
+            this.#model.incrementScore();
+        } else {
+            this.#model.resetScore();
+        }
+        this.#updateScores();
+    
+        await this.#delay(1000);
+    
+        this.#btns.forEach( (el) => {
+            el.style.backgroundColor = "#3CC3FA";
+            el.removeAttribute("disabled");
+        })
+    
+        this.#nextRound();
+    }
+}
+
+class ViewModel {
+    #repo: CpuRepository;
+    #stats: Stats;
+
+    constructor() {
+        this.#stats = new Stats("highScore_socket");
+        this.#repo = new CpuRepository();
+    }
+
+    async init() {
+        await this.#repo.init();
+    }
+
+    nextRound() {
+        this.#repo.reset();
+    }
+
+    incrementScore() {
+        this.#stats.incrementScore();
+    }
+
+    resetScore() {
+        this.#stats.resetScore();
+    }
+
+    get currentCpu(): CPU {
+        return this.#repo.currentCpu;
+    }
+
+    get score(): number {
+        return this.#stats.score;
+    }
+
+    get highScore(): number {
+        return this.#stats.highScore;
+    }
+}
+
+export async function main() {
+    const ui = new UI();
+    await ui.init();
+}
\ No newline at end of file
diff --git a/src/statistics.ts b/src/statistics.ts
new file mode 100644
index 0000000..f320c64
--- /dev/null
+++ b/src/statistics.ts
@@ -0,0 +1,34 @@
+export class Stats {
+    #score: number;
+    #highScore: number;
+    #highScoreStorageKey: string;
+
+    constructor(highScoreStorageKey) {
+        // used as key for localStorage
+        this.#highScoreStorageKey = highScoreStorageKey;
+
+        this.#score = 0;
+        this.#highScore = Number(localStorage.getItem(this.#highScoreStorageKey)) ?? 0;
+    }
+
+    incrementScore(value = 1) {
+        this.#score += value;
+
+        if (this.#highScore < this.#score) {
+            this.#highScore = this.#score;
+            localStorage.setItem(this.#highScoreStorageKey, this.#highScore.toString());
+        }
+    }
+
+    resetScore(): void {
+        this.#score = 0;
+    }
+
+    get highScore(): number {
+        return this.#highScore;
+    }
+
+    get score(): number {
+        return this.#score;
+    }
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..17a2a90
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,10 @@
+{
+    "compilerOptions": {
+      "outDir": "./js",
+      "allowJs": true,
+      "target": "ES2017",
+      "lib": ["es2018", "dom"],
+    },
+    "include": ["./src/**/*"]
+}
+  
\ No newline at end of file