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Ballast
A lump of bubble gum sinks and floats: tear an arrow off to dive or rise a layer, and the layer's current carries it.
A lump of pink bubble gum floats in layered water, candy cells pressed into it. Tear off an arrow down and it dives a layer; an arrow up, and it rises — the layer's current carries it on. A charge stuck to the reddish wall bursts it two seconds later: swim off in time. Collect three stars and reach the finish without touching the spikes.
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