Take a left turn and pick a door, and you'll find - exactly where the map said it was - the rain filters?.

The rain filters? appear to be enormous grates both on the ceiling and under your feeth. Both of them are raining in opposite directions.

The first five minutes are chocolate pudding. There is then a brief spell of custard, followed by rainbow dye that stains skin and clothes.

You might want to be out before the ping pong balls. You definitely want to be out before the drop bears.