Product review (5 stars): and it spins it pretty quickly, which helps hook the pieces together and ...
There seem to be a few different variations that are roughly the same.  There are Beados which are nearly the same thing as Qixels but instead of being cube-ish they are more hex shaped round sphere things.  They all operate roughly the same.  You have some pattern, you align the bead/cubes and then spray them with whatever, that causes them to melt a bit, and then they stay stuck together.  A new fangled version of Perler beads.

This set is the 'Turbo Dryer', basically you press a button down and it will spin your creation out, you will have to pump the button quite a few times, and it spins it pretty quickly, which helps hook the pieces together and dry them out as well.

I prefer the Qixels style the best, I think the squares look nice and they hook together well.  This also includes 500 Qixels and various other pieces, storage sets, templates, etc.  Our five year old enjoys doing this, but does need some help, and has to be careful with bumping the platform.  She also needs help drying them out with the spinner here, but she should be able to do it on her own pretty soon.