Abstract : Over the more than three years of the project Verification Games: Crowd-sourced Formal Verification the verification tools developed by the Programming Languages and Software Engineering group were improved. A series of games were developed by the Center for Game Science: Pipe Jam, Traffic Jam, Flow Jam and Paradox. Verification tools and games were integrated to verify that the Hadoop-common program satisfies constraints that render it free of the following vulnerabilities: injection attacks, incorrect use of format strings, violations of documented locking conventions.