New Warcraft III map - no need to leave the house today

Blizzard always hits us on the weekends with these new maps. For that, we love them. For that, our spouses hate them. This time around we get a big one:

Every baby worm dreams of being a gladiator in the worm arena, where burly worms battle it out to eat sheep, grow,
and squish their adversaries.

    Suggested Players: 4-12

    Size: Tiny

    Tileset: Dalaran

If the map size is tiny, then why is the file 412k? Must be some goodies here...