There are three combos I think: 1-2-3-4 (x5 multiplier) 3-6 (+1000 points) 5-6-7 (x8 multiplier) The 5-6-7 one is both the easiest to pull off and the most points, so it ends up being a big factor for score. I mostly get 3-6 out of luck, and pretty much never get 1-2-3-4 because going for a 4 chain combo introduces structural weaknesses if you get bad tiles (e.g. you probably just die). I always try to go for 5-6-7 but it doesn't always work out. You don't need the prison to use pets - the prison only unlocks the pets that cost gems. In order to get most pets you need to score over a certain amount. So there's a fun little loop where you get a high score, which unlocks a pet, which lets you get an even higher score.
I am unable to download / find this game in the appstore on my iphone 6 in Switzerland. Any solution for this?
The game has only been released in a few countries. I live in Australia and that app store doesn’t have the game. I had to make a US account (if you don’t know how just google it, it’s pretty easy and you don’t need any money in the account to get free games) and was able to download and play it that way.
The game is now available in the Belgian store. You might want to check your country's store as well.