Slendytubbies classic map is a recreation of an original horror game, where you got to find all Tubby Custards. The action takes place in a fictional place called Teletubbyland, which is presumably a home planet for Teletubbies. To win the map, one needs to explore the area while being haunted by an aggressive mob. Being caught means to lose and, therefore, to start from the beginning. The trick will be to memorize the whereabouts of each Custard to find it faster on your next run.
Credits: ArathNidoGamer
How to install maps:
Download .mcworld file below
Open file using any file manager to import it into Minecraft PE
Open Minecraft Pocket Edition and look for the map among your worlds