Yume Nikki 3d is a fan game based on Yume Nikki universe. The game is not a simple 3d remake, but rather a spin-off to the original, with lots of extra content.
Very interesting little game. The atmosphere is excellent and pretty creepy.
Some might find the general aspect of traveling around searching for items and keys tedious so that's why you need good memory... and a small bike to help with the speed. ;)