Unfortunately, it’s a lot easier to sell games than neuroscience. Take an assessment, play games based on that assessment, and take the assessment again --- garbage in, garbage out. The value is in identifying congitive deficits so that proper strategies may be put in place that can be practiced in a variety of contexts such that they are actually transferable to everyday life. There's not a heck of a lot of science in the Lumosity baseline either, since all their data comes from an uncontrolled environment on the web. But there are a number of valid, peer reviewed online neurocognitve batteries available without having to go to a psychologist for a few grand.
NIH Toolbox (for researchers) http://www.nihtoolbox.org/Pages/default.aspx
Mindprint Learning (which has the Penn CNB for children) https://mindprintlearning.com/
Brain Resource (which has the Web Neuro for adults) http://www.brainresource.com/mybrainsolutions/personal