Grass Land is the very first world of Super Mario Bros. 3, where it was taken over by Larry Koopa.

In Smash Fighters Z

In Smash Fighters Z, the Amazing Mirror fell into the Grass Land, the heroes travel here to find the next Chaos Emerald, but are followed by Dark Matter, the Amazing Mirror appears to have landed somewhere in World 1-3. Grass Land appears once again when the heroes begin searching for one of the Wands of Power.