Hi Tampasailor!
Lumosity is a website that has "games" that you use to improve cognitive abilities like memory etc. I wouldn't recommend them for anyone still suffering acute PCS symptoms but once you get to the stage where you want to try to improve your abilities it's worth trying.

From the lumosity website:

You have the power to improve your brain

Scientists once believed that mental ability was fixed after childhood. But over the last few decades, neuroscientists have discovered that adults’ brains are constantly changing – growing new neurons and connections – in a process known as neuroplasticity. Lumosity takes advantage of the brain’s innate neuroplasticity to help shape it into a more effective, powerful organ.

Instead of teaching specific skills that may only be useful in specific areas, Lumosity targets core cognitive processes that underlie performance in many different areas. These processes include memory, attention and other abilities that are critical in the real world.