A downloadable game for Windows, macOS, and Linux

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  • 15 levels and more* .
  • Runtime Level Editor.
  • Developer candy (open source).

*When a new level is released, it is downloaded automatically when opening the game. Only the most recent level will be downloaded. If you want to know when a new level is out, follow me on itch.io!



KlSS (Key, love, Sword, Shield) is a simple puzzle game with retro (Atari 2600) aesthetics. The first few levels expose the main features and serious challenges come after that. You like challenging your mind? Give this game a try.



  • Arrows: Move
  • Space: Retry
  • Esc: Quit game


Level Navigation

  • PageUp: Next level
  • PageDown: Previous level


Level Editing

Levels are located in the Content subfolder. To create a new level, turn ON level editing and use the PageUp button to go past the last level. This should bring you to a very minimalist template level. Edit it at will and then save with the Floppy Disk icon.

  • Tab: Toggle level editor
  • Mouse click
    • On level: Paint tile with selected brush
    • On tiles at the right: Select brush
    • On floppy disk at the bottom: Save level to file
  • Right mouse click (on level): Erase tiles
  • Mouse wheel: Select next/previous brush


Are you a game developer?

KlSS is my first attempt at using MonoGame (I've been using Unity). Here's the stuff that might interest you:

  • It is opensource.
  • It integrates CircleCI; the game is built automatically for Windows, Mac and Linux each time a commit is pushed to GitHub.
  • It will soon integrate Butler; the game will be built and uploaded automatically to Itch.io when a commit is pushed to the master branch.


Special thanks

  • Jean-David Moisan, for inspiring me into using MonoGame;
  • Gabriel Le Breton, for his integration of CircleCI.
Updated 20 days ago
PlatformsWindows, macOS, Linux
Tags2D, atari, pixel, Retro, Singleplayer


Download NowName your own price

Click download now to get access to the following files:

klss-linux-64-beta.zip 22 MB
Version 7
klss-osx-64-beta.zip 22 MB
Version 7
klss-win-64-beta.zip 21 MB
Version 7

Development log

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