Recently, the internet is talking about a gamified to-do list; http://habitrpg.com. You are earning points and gold coins by keeping a pixel character (tamagotchi alike) alive and upgrade to the next level in a dungeons-and-dragons-feel text-based environment. All you need to do is to accomplish your tasks.
If you gain enough experience, you’ll get to the next level and your health will be restored. You also earn gold points for completing tasks and making positive progress on your habits, which you can use to (figuratively) purchase items like weapons and potions from the store to help you on your journey.