Match 3 , core complete

A little progress on Match 3 today. Not as much as I'd like, I spent a lot of time tracking down occasional "stops" where an item just didn't drop.

Turned out in the end that when it dropped it very occasionally collided with the one dropping immediately below, causing it to stop.

Basically the core now works - you can play a level through to the end, all that is left is to complete the front end and the "unlocking" of levels.