Figured I'd post something up to encourage myself to keep going for the first extend / stage 4.
When I try to play for score on this game I always end up making careless mistakes, so I'm going to focus on survival.
One thing I noticed though, which I didn't see covered anywhere (though it probably is), is if you collect a bomb when you already have them maxed it increases your jewel multiplier by 10(?) and you can really start scoring much easier.
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kuze - 2,274,400 - Bolt & Nail - Stage 3 - PCB