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If you're just interested in the exercises without all the code review shenanigans that the site + CLI tool offer, they're all available on https://github.com/exercism (all the ones named `x$language`).

One of the issues is that it was originally designed as a mentoring platform, so you would be led through it by a friend that knows the process. The help link is very good for some languages, but could use some love for other languages.

Lots of info on using exercism.io at http://help.exercism.io/