Please HELP me learn how to play this game !!

Where can I find complete instructions on this game? What are locks, keys, snowflakes X2, X5 etc. I love this game but it is sooooo frustrating not knowing how to play. Are there tips & stratagies somewhere? This is the 9th game purchased from Oberon Media and three of them I don't even bother trying to play anymore due to lack of instructions. Can one of you "Chainz 2" masters please clue me in?

Hi I have started playing this game again and love it and cant quit.

the snowflakes freeze the board so you can find and make long chains.
The locks have a hidden star, number which multiplies your score, a letter. I dont remember seeing any keys.
I am on level 7. I start at the top and play there first.

Good Luck!