Celador's first work that SPOnG is aware of is the 2004 title, "Who Wants To Be A Millionaire? 2nd Edition" (GBA).
The company has been involved titles released on the PC, Wii, DS/DSi, PS2, PSP and GBA.
The company's most recent involvement was on the 2008 release "Who Wants to be a Millionaire? 2nd Edition" (DS/DSi).