Atomino

In Atomino your task is to combine atoms into molecules... Now, we all know that atoms are normally on the small side, and they appear to spend most of their time aimlessly flying around, a fact that complicates their handling. Therefore, in Atomino, we have objects which look like atoms, smell like atoms, and, just like real atoms, have the capability of combining with one another. They are, to all intents and purposes: atoms - aport from the size factor, of course.
These atoms have a valance {look it up} of one to four, i.e. they can combine with one, two, three or even four other atoms.
Let me explain: imagine these atoms as small, naked, spherical, swarming beings, each armed with up to four hands. When two swarmers shake hands {when two atoms combine}, each now has one less free hand {henceforth, free hands will be called free combinations, otherwise this manual may begin to sound kind of silly...}
A complete molecule is defined simply as a structure of atoms in which there are no more free combinations.

What is abandonware ?