A downloadable tool for Windows, macOS, and Linux

Buy Now$14.99 USD or more

Bitty Engine is a cross-platform itty bitty Game Engine. The full featured engine is programmable in Lua and integrated with built-in editors. It keeps the nature of both engine's productivity, and fantasy computer/console's ease to iterate. It boosts your commercial/non-commercial projects, prototypes, game jams, or just thought experiments.

Why Bitty Engine?

Bitty Engine has everything built-in for coding, graphics composing, etc; it has a full featured debugger for breakpoint, variable inspecting, stepping, and call-stack traversing; it offers a set of well-designed API with full documentation; it builds fast binaries with code and asset obfuscating, moreover its package size is small (around 10MB with empty project, other engine outputs more than 10 times bigger).
It is supposed to be your ultimate 2D game creating software.


  • Programmable in Lua, an easy to learn and widely used programming language
  • Debugger with scope inspector, breakpoint support and stepping
  • Easy to use API for resources, graphics, input, audio, and more other facilities
  • Built-in libraries for File, File System, Archive, JSON, Network, Physics, etc.
  • Dozens of various example projects
  • Handy tools for editing sprite, map, image, text, JSON, etc.
  • Project can be exported into standalone binary


  • Display: configurable resolution
  • Code: Lua, supports multiple source files
  • Image: either true-color (PNG, JPG, BMP, TGA) or paletted, up to 1024x1024 pixels per file
  • Palette: 256 colors with transparency support
  • Sprite: up to 1024x1024 pixels per frame, up to 1024 frames per sprite
  • Map: up to 4096x4096 tiles per page
  • Font: supports Bitmap and TrueType
  • Audio: 1 BGM channel, 4 SFX channels; supports MP3, OGG, WAV, etc.
  • Gamepad: 6 buttons for each pad (D-Pad + A/B), up to 2 players
  • Keyboard and mouse: supported


Bitty Engine helps you to make standalone binaries for Windows, MacOS, Linux and HTML (WebAssembly). It is redistributable for both non-commercial and commercial use without extra fee, your project is totally yours.

System requirements

OS Windows 7 or later (32/64bit), MacOS 10.13 or later (Intel 64bit), Ubuntu 14 or later (32/64bit)
Processor 1.5GHz
Memory 512 MB RAM
Graphics Intel HD
Storage 150 MB available space



  1. Download and unzip the zip package
  2. Execute "x64/bitty.exe" or "x86/bitty.exe"


You need to allow 3rd-party apps running on your Mac.

  1. Download and unzip the zip package
  2. Apply execution permission to the executable (i.e. "xattr -cr bitty.app", then "chmod 777 bitty.app/Contents/MacOS/bitty_drm_free")
  3. Execute by double clicking "bitty.app"


  1. Download and unzip the zip package
  2. Apply execution permission to the executable (i.e. "chmod 777 x64/bitty")
  3. Execute "x64/bitty" or "x86/bitty"


(The Itch version and the Steam version offer an identical set of features, and they are both DRM-free.)

PlatformsWindows, macOS, Linux
Rated 4.6 out of 5 stars
(5 total ratings)
AuthorTony Wang
Tagsbitty-engine, game-development, Game engine, lua, programming


Buy Now$14.99 USD or more

In order to download this tool you must purchase it at or above the minimum price of $14.99 USD. You will get access to the following files:

Bitty_Engine_v1.2.2_win_x64_x86.zip 53 MB
Bitty_Engine_v1.2.2_macos_x64.zip 53 MB
Bitty_Engine_v1.2.2_linux_x64_x86.zip 59 MB

Development log

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