If you're a fan of action adventure games, be sure to check out on Humble Store's latest free game offer for this round - a free copy of Psychonauts worth $9.99 for a limited time only.
To claim your free copy of Psychonauts, kindly visit the following link to Humble Store at https://www.humblebundle.com/store/psychonauts. Do note that you will need to get yourself registered at Humble Bundle in order to claim this limited time offer. The redemption deadline is September 30th, 2017 at 10:00 AM Pacific, so do activate the key given once you've received it.
You will be guided to the page as seen in the screenshots above, just scroll down to the bottom of the page to get the key you need to activate the game.