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Got this for my daughter's birthday and the bubble solution it comes with actually makes a continuous stream once the circuit is wired right. Took her about twenty minutes to get the layout correct, then she ran it for an hour straight. Best money I've spent on a toy in a while.

My nephew figured out the circuit layout in about ten minutes and then refused to take it apart for dinner. The continuous bubble stream is the best part, no button mashing required.

The bubble solution actually lasts longer than I expected, and the continuous stream kept my kids busy on the patio all afternoon. Watching them figure out the circuit on their own was the best part.