I Built a Mobile Puzzle Game in Vanilla JS — No Framework, No Build Step

I Built a Mobile Puzzle Game in Vanilla JS — No Framework, No Build Step When clients approach us at CodeBuddy.tech asking about mobile game development, they often assume we need React Native, Unity, or some heavyweight framework. Recently, I decided to challenge that assumption by building a complete mobile puzzle game using nothing but vanilla JavaScript, HTML5, and CSS3. The results surprised even me. The game runs smoothly on mobile devices, has touch controls, persistent scoring, and weighs in at under 50KB total. No npm install, no webpack, no build pipeline — just pure web technologies doing what they do best. Why Choose Vanilla JavaScript for Mobile Games? Before diving into the technical details, let's address the elephant in the room. Why vanilla JS when frameworks exist to make development easier? Performance is the primary reason. Mobile devices, especially budget Android phones, have limited processing power and memory. Every layer of abstraction costs performance. When y