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Humble Bundle [humblebundle.com] has 11-Item Perplexing Puzzles Game Bundle (PC Digital Download) on sale $10.

Product Description from Store:
Flex your puzzle-solving skills and bend your brain into new shapes with this bundle of the best puzzle games! Challenge your sense of reality and jump inside the instant camera photos you take in Viewfinder! Solve logic puzzles to progress through a mysterious world full of secrets in Taiji! Work as a team and solve both halves of a puzzle to escape a deadly experiment in two-player co-op Parallel Experiment! There are even more exciting puzzle games to lose yourself inside in this bundle, so don’t get stumped—grab it now at the price of your choice, and support the Trevor Project with your purchase!