Android/iOS: If you're going to spend time playing games, the option of scoring free food is always nice. Drop Into Maccas's is a McDonald's-sponsored game that offers free menu items if you can beat the daily target score.
As the name suggests, there's a skydiving theme to the app. McDonald's recently said it wanted to amp up its mobile app development, and I guess this is proof. The free food offers runs through until 23 December, and you have to claim your food (which has a maximum value of $3) within 24 hours.
Drop Into Macca's [iTunes App Store]