Two different Halo games have been released by Microsoft to the iOS device ecosystem this week. The first is Halo: Spartan Assault, a top-down action battle sort of game - the other is... another game with nearly the same title and almost identical gameplay. That'll be Halo: Spartan Strike. Both games include 30 levels of gameplay and have the same price point. Note - if you will - that these aren't the same sort of game that you'll be playing in first person on your Xbox One - they're a completely different sort of Halo.