Toronto’s Cassie Creighton might be the toast of the online gaming world, but you’d never know it at first blush.

“It’s okay,” she said Thursday, shyly pulling her right foot up to her mouth and chewing on the purple sock covering her big toe.

Then, after climbing from under a coffee table in her dad’s Spadina Ave. office, she declares: “Almost everybody in the whole world likes my game.”

Overstated? Perhaps.

But you can excuse her enthusiasm. She’s just five years old.

Cassie is the inspiration, artist and voice behind Sissy’s Magical Ponycorn Adventure, an online game created by her father that has gone viral on the Internet, played more than 150,000 times in just over a week.

Ponycorn? Think unicorn, only smaller.

Ryan Creighton, game creator and founder of Untold Entertainment, took Cassie to a two-day “game jam” a few weeks ago to challenge hundreds of other game makers in a time-limited effort to create a new game.

Inspired by Cassie’s drawing of ponycorns and what a little girl named Sissy might have to do to capture five different coloured ones, they worked through the weekend to make the game a reality.

Cassie got to go home and sleep, but dad went back to the gaming boiler room to work through the night, scanning her pictures and doing the technical computer work to make it all come alive.

The result is Sissy’s adventure, which online game reviewers have called “impossibly cute.”

Maybe it’s the childlike crayon drawings. Or Cassie’s oh-so-cute voice. Or maybe it’s the tiger and big, evil lemon Sissy has to tame along the way.

“It’s just exploded,” Creighton, 33, told the Toronto Star. “It’s not violent. It doesn’t have unnecessary, gratuitous gore.”

He said the initial concept was to have a game “steeped in imagery of puppies and kids and rainbows, but still with a hardcore difficulty level.”

When his laptop couldn’t handle the demands of creating a really complex game, he took a simpler route.

Cassie coloured for six hours, taped dialogue for a few more, and joined her younger sister, Izzy, 2, in making music for the background.

All of which is a fresh approach in what Creighton calls “a really cynical industry.”

“Gamers play these really macho games,” he said. “I think it’s just nice for them to relax and know they can enjoy something that doesn’t have blood and guts and violence and nastiness in it.”

And he said Cassie is rewarded, too.

“I think it’s important for her to see the fruits of her labours,” he explained. “She realizes now that effort and hard work translate into results and success — and that’s fantastic.”

On his company’s website, Creighton asks gamers to donate to Cassie’s education fund. It’s already garnered more than $2,000.

The game can be played free online at untoldentertainment.com/games/sissy.