The Gadget Sandbox Chronicles
A complete six-book building adventure for readers 8 to 12. Captain Cubemelon and his friends link six worlds, one gadget at a time, with teamwork and clever thinking instead of fighting. No cliffhangers-forever, no waiting for the next one. Start with The First Build (Book 1).
Portal Park (The Gadget Sandbox Chronicles, #6)
From the series:
The Gadget Sandbox Chronicles
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