The NanoSpace Molecularium is a nice educational game produced by Rensselaer Polytechnic Institute. It is available to play in a web browser and is available as an iOS and Android app. The purpose of the game is to provide elementary school and middle school students with an introduction to the properties of atoms and molecules. The NanoSpace Molecularium is a virtual amusement park that students can click through to find videos, games, and other short lessons about atoms and molecules.
Students enter the NanoSpace Molecularium through the "Hall of Atoms & Molecules." From there students can choose which of the four parts of the amusement park they want to explore first. The four sections that students can explore are DNA Land, H20 Park, Sizes of Molecules, and Molecular Materials.
Here's a video about the game.
Applications for Education
The NanoSpace Molecularium can be used by students with or without creating an account on the site. The benefit of creating an account is that students can keep track of where they left off during their previous visit.