Players who played Halo 3 and 4 on Xbox 360 had to beat the games on Legendary to see the secret endings, but all Master Chief Collection owners have to do is sit back and watch. All the levels on all the campaigns are open right from the start of the game and you can play them at any difficulty. In Halo 3 and 4, the last stage isn’t a stage – it’s an epilogue cutscene. If you want to see the secret endings, all you have to do is select the level, turn up the difficulty to Legendary and sit back. Halo 3 offers a tease for what would eventually be Halo 4 and I won’t spoil Halo 4’s secret ending if you haven't seen it (and don't want to google it). All you have to do is wait a few days. Source:Gameinformer
