Giana Worlds (dubbed as Giant Worlds) is a 2D singleplayer platform freeware game based on The Great Giana Sisters created by Rainer Insch in 1999 and published with permission from Armin Gessert. As of now, the game hasn't seen any further development since 2001, but it had a sequel known as Giana Worlds 2 which ended up being halted on any further development. In 2003, it become Giana's Return, this is why levels are similar between these two games.