ESA invites secondary school students to participate in a challenging competition to explore the high-energy Universe. Students at secondary school are invited to choose from four projects relating to ESA's INTEGRAL gamma-ray observatory in which they are challenged to Observe, Research, Design or Build. A number of great prizes are on offer, the top prize for the overall winners of each project is a trip to Paris, France, to attend and present their work at the 9th INTEGRAL science workshop. The competition will run until 31 March 2012.