Pick what you want to sort by. Grey bubbles are unsorted thoughts —
shoot each one into a colored cluster to assign it that value. Type comes first: a thought unlocks the other sorts once it has a type.
Aim with your pointer or the ← / → keys; click, release or press
space to fire; ⌫ undoes the last sort. Bubbles bounce off the walls, just like
the arcade — and when a cluster gets crowded, landing on it pops three bubbles
back out.