 If you liked
Hyakuman-jou Labyrinth
|
 ...then you might like
Tate no Kuni
|
Both works feature bizarre, physics-defying, seemingly endless worlds that require a lot of ingenuity and ad-hoc engineering to navigate.
Hyakumanjou Labyrinth takes a somewhat more reserved approach and explores the videogame-like aspects of such a world, while The Vertical World goes all larger than life by the end.