Ah I see, sorry. The controller needs to be plugged in before you start the app. For keyboard controls press [space] to accept and [left shift] to join the race. I guess that could have been made clearer in the game. Hope that helps. I recommend the a controller.
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If you download the Oddball_Racers_Win.zip file. Extract the files using your favourite decompression software. You can play on PC to your heart's content. Or are you saying the game crashes on your machine? If so can you provide more info please so I can fix your issue.