iOS: CARROT is a little to-do app with the personality of an evil robot that gamifys your tasks. A recent update adds a bunch of new features, including alerts and unlockable mini-games.
CARROT is still a sadistic little to-do app, but a bunch of new unlockables make it a lot more fun to use. For example, you can now unlock "Happy Pills" to calm CARROT down so it stops bugging you when you don't check items off the list. You can also unlock alerts to bother you when you haven't been using CARROT for a while. Even the unlockable mini-games are a little sadistic and include quiz questions and word scrambles.
If you're already using CARROT, this is an update that adds some fun new content, and if you're new to CARROT, it makes it a bit more useable as a to-do list.
CARROT: The Todo List with Personality [iTunes App Store]