The RoboCup Humanoid League has set itself the ambitious objective of developing humanoid robots capable of winning a soccer match against the most recent FIFA World Cup champions by the middle of the 21st century. This paper provides an overview of the development and performance of CIT Brains, the winning team of the RoboCup 2024 Humanoid League KidSize class, within the context of the league’s evolving trends and challenges. The SUSTAINA-OP2 robot represents a significant advancement from its predecessor, the SUSTAINA-OP robot, which was first introduced at RoboCup 2022. In response to the ongoing developments of the league, the SUSTAINA-OP2 incorporates newly released actuators and a new computer board. The robot was constructed using components that can be readily procured through online shops in conjunction with custom parts sourced from external manufacturing services. All design data is made available as open hardware on  . These developments are based on the league’s progress and will facilitate future competition requirements.