[Showdev] Blitzy: a lightweight 2D game engine in Kotlin

xeroup — Sun, 11 Jan 2026 14:19:54 +0000

Lately i've been working on creating my own game engine in Kotlin. Why? i wanted to create my game, but whenever I found some engine for Kotlin, i constantly ran into problems: either it was too complex, or it lacked features, or the documentation was outdated. In the end, i decided - it's better to make my own, minimalistic one, but tailored precisely to my needs.

that's how Blitzy appeared: a simple and minimalistic 2D engine.

what functions does it have?

playing sounds and their control
creating simple hitboxes
keyboard and mouse input checking
tile system (tileset, tilemap), loading tilemaps from csv
entity classes
loading ttf fonts and creating texts
quick switching between scenes and saving them
drawing simple geometric shapes

example code:

import org.xeroup.blitzy.core.Game
import org.xeroup.blitzy.core.Settings
import org.xeroup.blitzy.graphics.Color
import org.xeroup.blitzy.graphics.DrawContext

// main class
// red square on a gray background
class ExampleGame : Game() {

    override fun settings(settings: Settings) {
        settings.width = 800
        settings.height = 600
        settings.title = "Game"
        settings.decorated = true
        settings.background = Color(0x222222)  // dark gray
    }

    override fun create() {
        // here you can initialize something, for example create a tileset
    }

    override fun update(delta: Float) {
        // update every frame
    }

    override fun render(draw: DrawContext) {
        draw.fillRect(350, 250, 100, 100, Color.WHITE) // fill square
    }
}

// start game
fun main() {
    Game.run(ExampleGame())
}

technical side:

built on LWJGL3 with OpenGL rendering. the codebase is straightforward and easy to modify - perfect for learning or customization.

the project is fully open source under the LGPL license. I welcome feedback, bug reports, and contributors!

and also, i made a game pong on the engine:

links

github: https://github.com/xerooup/blitzy2d
docs: https://github.com/xerooup/blitzy2d/tree/main/documentation

Forem: xeroup

[Showdev] Blitzy: a lightweight 2D game engine in Kotlin

what functions does it have?

example code:

technical side:

links