We are saying goodbye to ActiveDen on February 29. Please make sure you download any ActiveDen items before then! Read more.

Seek the differences

Seek the differences

Spot the differences! Both sides of the screen are a little different…


  • Well-documented: Read-me PDF included.
  • Easy-to-use level creation with instructions in the Read-me.
  • Resizability: application will scale to the size of the images used
  • Toggleable title text
  • The differences will be randomized across both screens. Random but balanced, so not too many differences appear on one side of the screen.
  • Particle effects
  • Debug mode

    Editable in XML

  • Path to images of the levels
  • Path to sounds
  • Hide mouse (yes/no)
  • Use sound (yes/no)
  • Use title (yes/no)
  • Positioning of elements

    Example: creating a level

  • Design a level. Put all the differences on the layers and the background on a layer. The PSD file of the first level is included for reference.
  • Export this image as “level_name_differences.jpg”.
  • Using the Photoshop layers, hide any differences so only the pure background remains, which stays constant on both screens.
  • Export this image as “level_name_clear.jpg”.
  • The last step is to create an image with hitfields. These are the places that are mouse sensitive and will trigger a difference. Though not completely necessary, best results are given when the image is binary: only fully white (#FFFFFF) and black (#000000). Make sure each hitfield is a clearly defined region.
  • Export this image as “level_name_hitmap.jpg”.

    How does this work?

    The program will look for ‘islands’ in this hitfield picture and mark each individual island as a new difference.

    Using hitfields means you will not need to bother with manual positioning of differences or counting how many differences there are — the program handles it all for you!

    A debug mode is included to help you ensure everything has gone right.

    Sound effect by Erratic from freesound.org

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