The new app was developed by DHX Interactive and will be released at the same time as Creative Content Digital releases the Grandpa in my Pocket audio book and after the new Grandpa in my Pocket DVD release by Abbey Home Media - The Magic of Christmas.
In the game, Mr Whoops has had some toys delivered for the Sunnysands Summer Party. One of the toys hasn’t been sent so he goes to the factory to find it.
Meanwhile, Floyd decides to organise a treasure hunt – hiding all the new toys round Sunnysands with clues to where they can be found.
Grandpa realises that the best way he can help is to shrink and get into all kinds of places. The game player has to help Jason and Grandpa get the toys into Campo and back into Mr Whoops' shop before he gets back.
Anne Loi, SVP finance and operations, at DHX Media and head of DHX Interactive, said: "Following the success of the Horatio Heave Ho! ebook, and coming hot on the heels of the newly released audio book and DVD, fans of Grandpa and Jason can now watch and engage with their favourite series across multi-platforms.
"This is an innovative new game, with content perfectly pitched for the Grandpa in My Pocket audience and their families."