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Build freely as a guest (1 map, limited tower/monster/wave types).
Sign up with a public username (email stays private) for the
closed beta: higher type limits, up to 5 saved games,
and player features like leaderboards later.
After approval we email a verification link; your editor draft is held while you wait.
OpenTD documentation
Learn how to design maps in the browser editor and how portable game files work.