The Couchbase Mobile Holiday Mini-Hack Challenge is a 30-minute development challenge for mobile developers. It's designed to be a fast, easy, and fun way to explore Couchbase Mobile and can be completed in just 30 minutes. The challenge consists of building an online/offline app using a basic set of Couchbase Mobile APIs and comes with step-by-step instructions to help those who get stuck. The goal is to stimulate developers of all skill levels and provide a fun holiday activity.