The Mummy's Revenge. 1st in The Mummy Monster Game Set

Action fantasy adventure
Book 1 of a 3 Book set (Also available as The Mummy Monster Game complete 3 book set. 3 novels in one Monster Kindle Edition).

Book 1 THE MUMMY's REVENGE... is deadly (USA) (or 'The Mummy Monster Game' in Australia)

Book 2 Who knows the secret of... THE MUMMY'S TOMB (USA) (Or 'The Mummy Tomb Hunt' (Australia)

Book 3 'The Mummy Rescue Mission' (Australia)

Little Cousin Harry is really weird, but he is family, so Josh and Amy decide to play along with him. They join Harry in playing a series of totally spooky ancient Egypt computer games.
Trouble is, Harry's games become more and more real and dangers start to leak out of the games into real life and into their lives.
The popular Egypt series - now available in one mega book of three adventures.