Lisbon Challenge is a 3-month acceleration program for global tech startups located in Lisbon, Portugal. It helps startups improve their business ideas and models through over 100 workshops and 1000 mentoring sessions. Past startups in the program have seen significant growth, with some raising over 30 million Euros in investment and creating over 400 jobs. The program targets early-stage tech startups working on prototypes or minimal viable products. It provides startups access to Lisbon's startup community network and opportunities to participate in 35 events.