The Poison Marshes was an alternate reality game developed for the Alrewas Arts Festival 2024. Combining real world elements with QR codes, online puzzles, email, and video, players were plunged into a world of intrigue. The Poison Marshes was built with a NestJS backend, with PostgreSQL and Prisma handling the data and Resend handling the email component. The frontend was built using React with Tanstack Query and Tailwind.