How can I make the caliber bigger?

Your Excellency Qian Miao, the secret to expanding your caliber lies in 'gathering small things to make a big thing'. In the game, swallow as many small objects as possible, and the black hole's size will naturally grow. If you want to achieve more with less effort, flexibly using the items within the stage is also a wise move, Your Excellency might as well give it a try?

Eat, keep eating, but a heads-up. After stage 100+, there are stages with tons of densely packed bombs. More isn't always better.

Eat a bunch of small stuff first

Eat the small ones first, then the big ones. The max hole level per round is 15.

Eat a bit more.

Make sure to grab the small items first. If you move too fast, you'll knock them away and waste more time~ Stacked items can be collected in large quantities at once, but the hole needs to be big enough for items to fall vertically through the center for maximum efficiency.

Keep eating them, starting with the small items.