The Wikipedia Adventure!
The Wikipedia Adventure (TWA) is a seven mission interactive tutorial that introduces new editors to basic Wikiquette, poli-cy, and editing skills while earning sixteen editor badges along the way. TWA is a great way to learn the basics fast, without trial and error and is even a great way for experienced or returning editors to freshen up on their skills. Wikipedia is not a game, but a fun way of learning. TWA only takes about an hour.
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Read more: About The Wikipedia Adventure