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Ministry of Testing is a community hub for software testers, offering articles, courses, events (such as TestBash), podcasts, and an active forum with practical resources to learn and improve testing skills, including game testing.
More resources on Game Testing
Game Testing: All in One
A textbook on professional game quality assurance covering the tester's role, bug writing, test planning, combinatorial and test-flow techniques, cleanroom testing, and test automation. It prepares readers to design test cases and report defects the way studio QA teams do.
Game Development Essentials: Game QA & Testing
An introductory textbook on the game QA process, from the tester's role in the development cycle to test plans, bug reporting and databases, compliance and usability testing. It also explains QA career paths and how testing teams work with developers.