I have created some levels for Happyland adventures XMAS edition. 
They are in the attached file: slippy.zip 

Contents of "slippy.zip": 

villa.map- 
Treetop Villa 
Features a village in the treetops. A large, moderate/high difficulty level 
(Finding a particular secret area is the key to getting all 53 happylanders) 

----- 

slippy.map 
Slippy caves 
Features a cave with switches and several slopes. An average-size map low/moderate difficulty. 

----- 

Slipbonus.map 
A little bonus using the warping technique I recently learned. 