Habitica is a self-improvement web application with game mechanics overlaid in order to help the player keep track of and remain motivated to achieve their goals.

The game is laid out in the form of an RPG, in which the player collects items such as gold and armor to become more powerful. Rewards are achieved through maintaining real-life goals, in the form of Habits, Dailies, and To-Dos.

Wikipedia

Can’t say that I’ve come across the self-improvement web app Habitica before, but good to know there is a long list of Google Apps Script powered extensions, add-ons, and customizations.

Source: Extensions, Add-Ons, and Customizations – Habitica Wiki