The trailer for "Thank You For Playing" by David Osit and Malika Zouhali-Worrall.

In the summer of 2013, two Brooklyn-based filmmakers stumbled across a brief blurb on the video game website Kill Screen. It mentioned an independent game being developed in Colorado -- a reality game. 

Co-directors David Osit and Malika Zouhali-Worrall capture the making of the game in "Thank You For Playing." It's the story of Loveland parents Ryan and Amy Green as they care for one of their sons who is battling pediatric brain cancer. Ryan Green created a game, "That Dragon, Cancer," to go with the experience and to help others going through the same. Green and his team plan to release the game this fall.

The documentary "Thank You For Playing" premiered at the Tribeca Film Festival last week. 

Osit and Zouhali-Worrall spoke with Colorado Matters host Ryan Warner.