Positive Behaviour for Learning (PB4L) is a flexible framework that can be localised to ensure it is a culturally responsive approach to protect and promote student wellbeing and positive behaviour. One of the downsides is that it requires much paperwork. Teachers need to record behaviour, reward positive and report negative behaviour, and file incident reports. We designed and developed Ka Pai, a gamified mobile application prototype to help. It was evaluated with 10 teachers at an intermediate school in Auckland, New Zealand. Based on user metrics and feedback, the results indicated that Ka Pai supported teachers to efficiently and systematically record, reward, and report students' behaviour.