Buenas, antes existían los desafíos personalizados de Halo Reach en donde tú podías crear tus propios desafíos donde te daban una cantidad inferior de créditos pero te ayudaban para subir de rango antes. Estuve buscandolo en Halo Waypont y no me aparecen.
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To answer your question though, Custom Challenges were retired a few years ago and are no longer supported