"  21973 is just your average Roblox kid living in a blocky world! Battle monsters and avoid disasters in a Roblox world – all through the eyes of Ari and his friends.  Ari's dad is a Marine Biologist and has invited Ari, Zeke and Jez to a trip out to sea to track dolphins for his research. Ari and his friends are so excited, but there is something lurking deep beneath the water that might derail the entire day. Before they know it, Ari must find a way to save his dad and friends from danger without becoming prey himself! Join Ari, Zeke, and Jez in the sixth unauthorised action-packed adventure. Diary of a Roblox Pro is a must-read for any kid who loves to play Roblox! Full of action, adventure and fun! Perfect for gamers"