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So, I read this book in school, around the mid-2010s.
It was about a bunch of kids who were captured and being experimented on by a mad scientist, in a facility that might have (I'm not sure of this) eventually been revealed to be in space.
The children all had powers of some sort- I can't remember whether they had powers beforehand and that was why they were being experimented on, or if the mad scientist just decided to kidnap a bunch of random kids For Science! and the experimentation is what gave them their powers. Either way, the powers they had were pretty weird- I remember specifically there was this one girl whose hand turned into a hammer. Oh, and they had a Team Pet in the form of some unidentified creature that had also been subjected to (possibly even created in) the mad scientist's experiments.
Eventually, the kids figured out how to mount an escape (naturally, this involved cleverly combining all of their abilities, even the seemingly useless ones).
Other stuff I remember:
It was made for kids, so despite the "captured and experimented on" setup the tone was still somewhat lighthearted.
The cover had a colorful image of the main cast of children on it, including the aforementioned Team Pet, although the image made it look like a brick covered in purple fur (and with a pair of eyes sticking out of the fur).
The mad scientist was either mentioned or briefly shown to have performed an "experiment" with no actual science (mad or otherwise) in it; he was just torturing a lab mouse For the Evulz by pulling out chunks of its fur. I think he claimed that he was testing how "how many hairs you pull out at once" affects "how loud the mouse squeals in pain".
Oh, and I am REALLY, REALLY not sure about this, but I think at one point the narration used a weird expression that I think was an Australian-ism. Again, it is very possible that I'm misremembering and it was either another book or just a character with an Australian accent, so use this fact if it helps you search but please don't reject a possible match just because the author wasn't Australian.