In the top-right corner of the screen, you might see an icon like x1, x2, or x4.
Tap the icon to turn the booster on or off. When the booster is on, you’ll use more energy — but the items your generators produce will be higher level.
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x1: Booster is off. One energy gives you a regular item.
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x2: Costs 2 energy per tap, and items are one level higher.
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x4: Costs 4 energy per tap, and items are two levels higher.
Note: The booster doesn’t work on limited-use generators that come out of other items (like fruit boxes, seafood sets, etc.), or on generators that produce items for free.