Today, UK mobile game developer, Twiddly Studio, crams in even more content to the logic, number puzzle, SUM IDEA, with a free update containing 20 additional levels in a new area - Professor Addkins' 'Audio Lab'. The update also adds a fan-requested feature allowing players to listen to their own music (or Apple Music) while playing.

SUM IDEA tests your numerical logic solving skills by focusing your mind on switching numerical and mathematically functioning tiles which can possibly affect each others value or reverse their function entirely as you attempt to match the blueprint in Professor Addkins' thought bubble.

"Since launching this one-of-a-kind logic game we have been overwhelmed by the positive reaction to its unique concept and fans have been champing at the bit for more. With this update we're very excited to deliver brand new content, and to expand the SUM IDEA universe." said Andrew Noble, Technical Director at Twiddly Studio.

SUM IDEA is available to download and play for free from the iTunes App Store.