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We've been experimenting with optimal play to get the best return.
First - if you're not experienced with bubble shooters, there are a ton of free ones available. Download one or two, and practice. The [name of another game edited by Mod] series in particular is a popular one, but searching with the term "bubble shooter" will get you a wide variety of choice to practice aiming and bouncing off the side with.
After that, this is what we've gathered:
• 150 rocks for 50 stones appears to be a good average amount to go into the game with. More and you may not be able to use up all your stones before the timer runs out, less and you may run out of stones well before the timer is up with a lot of fruits left to be popped
• The slingshot does not just move within the game board, if you need to get further over for the bounce off the side, keep pulling off the side of the active board area. Not up or down - just to the side. It will keep pulling to the edge of your device screen.
• It is often better to aim at the cracks that hold up a line and take down a whole series of bubbles to get the fruits, than to aim at a specific fruit (and all the bubbles in the way to it). If you aim right between two bubbles you can often take them both down with one stone.
• The pointer appears to sight a little bit high for me. My sister says not an issue for her, but that it appears to be a little out of sync at the top of the board in general. Look for patterns for yourself, adjust your aim as needed.