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.


Special thanks

  • Jean-David Moisan, for inspiring me into using MonoGame;
  • Gabriel Le Breton, for his integration of CircleCI.
PlatformsWindows, macOS, Linux
Rated 5.0 out of 5 stars
(2 total ratings)
Made withAudacity, MonoGame, Paint.net
Tags2D, atari, Open Source, pixel, Retro, Singleplayer
Code licenseMIT License
Asset licenseCreative Commons Attribution_NonCommercial v4.0 International
Average sessionA few minutes
AccessibilityInteractive tutorial


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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