Hi @Anton_Oosthuizen_ZHR, the challenges are found in the main menu when riding in any world. Click on the menu button, bottom left of the screen. Once in the menu there will be a large picture to the immediate left of the orange achievement badge menu icon. I think it defaults to Italy or California. Click on the picture and on the bottom there is an option to choose a different challenge. Click there and choose Everest. Keep climbing well past the summit to get the tron bike.
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