In a world where computer skills are becoming increasingly important, Grant Hosford feels it’s never too early to teach children how to program – even before they can read.

To that end, Hosford co-founded CodeSpark in December 2014 to teach children as young as 4 the concepts of computer programming with the help of a word-free video game called Foos, in which kids solve puzzles and eventually design their own video games. The game uses images in lieu of traditional coding language and players can share their creations with other users.

More than 5 million children in 201 countries have played the game, and its success, Hosford said, can be attributed to being wordless.

“Pre-readers can play and anyone who speaks any language can play,” he said.

Hosford came up with the idea for CodeSpark when he couldn’t find a suitable source to teach coding to his daughter, who was 6 at the time. The subscription app costs $7.99 a month but is free for education nonprofits, libraries, and schools.

In late September, the Pasadena company raised $2.5 million in a second round of seed funding from some of the its original investors, Kapor Capital, NewGen Capital, and Idealab, which helped raise $1.35 million last year, as well as newcomers Felton Group, PGA Venture Partners, and some private investors. It has raised a total of $4.1 million.

Editor’s note: This story has been changed to reflect the correct amount of money raised in the second round of seed funding.