He is best known for being the concept creator and Director of Scribblenauts as well as the million-seller hit video game Drawn to Life[2] and 5th Cell's critically acclaimed Lock's Quest, all for the Nintendo DS.

Slaczka is credited as the Director, Lead Designer, Story Writer, Original Concept Creator and Art Director for both Drawn to Life and Lock's Quest.

Scribblenauts was the first handheld game ever to win a "Best of Show Overall" award (across all platforms) at E3 from IGN, GameSpot and GameSpy.

[citation needed] Drawn to Life has since gone on to spawn a franchise involving two sequels, accompanied by a Wii console version, all three titles published by THQ.

In 2000, Slaczka, along with Joseph M. Tringali (co-founder and General Manager of 5th Cell), co-founded Epix Interactive Studios, a video game developer, in Chicago, Illinois, that was developing Fate,[3] the first announced MMORPG for Microsoft's original Xbox.