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Feedback Game works in editor but not in build.

Discussion in 'Editor & General Support' started by DaReffy, Mar 3, 2023.

  1. DaReffy


    Dec 28, 2019
    Hello, I made a very simple 2D game based on flappy bird by following a tutorial. It works fine in the editor but after building it (default build settings) and then running it. It displays the "built with unity" watermark, however it then goes to a completely blank blue screen. I'm very new at Unity so I'm very lost. Any help would be appreciated!
  2. Kurt-Dekker


    Mar 16, 2013
    Welcome! Here's how to begin your debugging adventure!

    You must find a way to get the information you need in order to reason about what the problem is.

    Once you understand what the problem is, you may begin to reason about a solution to the problem.

    What is often happening in these cases is one of the following:

    - the code you think is executing is not actually executing at all
    - the code is executing far EARLIER or LATER than you think
    - the code is executing far LESS OFTEN than you think
    - the code is executing far MORE OFTEN than you think
    - the code is executing on another GameObject than you think it is
    - you're getting an error or warning and you haven't noticed it in the console window

    To help gain more insight into your problem, I recommend liberally sprinkling
    statements through your code to display information in realtime.

    Doing this should help you answer these types of questions:

    - is this code even running? which parts are running? how often does it run? what order does it run in?
    - what are the values of the variables involved? Are they initialized? Are the values reasonable?
    - are you meeting ALL the requirements to receive callbacks such as triggers / colliders (review the documentation)

    Knowing this information will help you reason about the behavior you are seeing.

    You can also supply a second argument to Debug.Log() and when you click the message, it will highlight the object in scene, such as

    If your problem would benefit from in-scene or in-game visualization, Debug.DrawRay() or Debug.DrawLine() can help you visualize things like rays (used in raycasting) or distances.

    You can also call Debug.Break() to pause the Editor when certain interesting pieces of code run, and then study the scene manually, looking for all the parts, where they are, what scripts are on them, etc.

    You can also call GameObject.CreatePrimitive() to emplace debug-marker-ish objects in the scene at runtime.

    You could also just display various important quantities in UI Text elements to watch them change as you play the game.

    If you are running a mobile device you can also view the console output. Google for how on your particular mobile target, such as this answer or iOS: or this answer for Android:

    If you are working in VR, it might be useful to make your on onscreen log output, or integrate one from the asset store, so you can see what is happening as you operate your software.

    Another useful approach is to temporarily strip out everything besides what is necessary to prove your issue. This can simplify and isolate compounding effects of other items in your scene or prefab.

    Here's an example of putting in a laser-focused Debug.Log() and how that can save you a TON of time wallowing around speculating what might be going wrong:

    When in doubt, print it out!(tm)

    Note: the
    function is an alias for Debug.Log() provided by the MonoBehaviour class.
    DaReffy likes this.
  3. DaReffy


    Dec 28, 2019
    I've attempted to debug everything. It's all working correctly from what I can tell. I have no clue how to debug the actual build version of the game as it crashes as soon as I open it.

    Are there any graphic settings or configurations that could cause this?
  4. spiney199


    Feb 11, 2021
  5. idunlop_oefun


    Aug 31, 2010
    The other posts cover debugging and strategies to discover what the issue is. Just taking a guess though... have you included your scene in the build settings? See here: