Experiment in making ice more treacherous. also tweak to snow/christmas flake spawn
foreach(dir
Art
Bamboo
Bath
Blox
Brick
Cake
Cave
Castle
Cheese
Christmas
Compost
Deepspace
Desert
City
CrazyMission
EarthRise
Eyes
Freeway
Golf
Halloween
Hell
Island
Jungle
Nature
Olympics
Planes
Sheep
Snow
Stage
Underwater
)
add_subdirectory(${dir})
endforeach(dir)