Brain Big Bang is a task motivation app that uses virtual cash rewards and punishments to encourage work and discourage distractions. It allows users to set tasks and hourly rates for working productively, allowing minor distractions, or lazing. Time spent on tasks is assessed and users earn or lose cash accordingly. Earned cash can later be exchanged for real-world rewards selected by the user to motivate completion of tasks. The aim is to boost focus and drive users to do more work by offering rewards and avoid losing cash through lazing or distractions.