Those games are Pool Nation FX and Child of Light. You have until the end of the month to get both of those, so don't delay!
On the Xbox 360, you can get both Gears of War Judgement and Terraria from now until the end of the day on April 15. On April 16, those games will go away and be replaced by Assassin's Creed: Black Flag and Army of Two: The Devil's Cartel. Those will obviously run until the end of the month.
