It could be a number of things, did you find out what the _fr thing was as mentioned above by somebody else? Are your rooms starting at the right location, if there is a variable in one of those rooms or object that isn’t being initialised first could be stopping the game running/starting. Are the graphics included in the html game file? If it works on windows it should work on html. You mentioned you removing things from your game that don’t work on html, is it possible you’ve missed something, or removed something vital? If your game loads/runs from the GM IDE when testing, then it could be something to do with the servers, either the file host or wix, what permissions are there? Try a different host see if that’s any better? Sorry I can’t be more help, it’s just gona be a case of trial and error.