Jesse Van Rootselaar, 18, created the virtual “experience” on the online gaming platform Roblox before his terrifying real-life rampage, a rep for the company confirmed.

The teenager that opened fire in a remote Canadian school had created a video game to allow players to simulate a mass shooting.

It even has a gun-shaped controller.

Zampella co-founded Respawn with Jason West in 2010, following them being fired from Activision after a period of tension ...