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Octonaughty becomes Infinaughty and can change the rules of Numberland at will - starting by turning everyone's blocks pink! Can the Numberblocks still work out who's who?

Twelve, Fourteen and Sixteen need to cross the Leap of Worth - but Infinaughty makes all Even numbers split in two! With only small, odd numbers left, what can they add up to?

Every Numberblock up to Fifty is needed to defeat Infinaughty - but some are missing! Unable to use addition, can the Numberblocks make their missing friends using multiplication?

Infinaughty traps the final missing Numberblocks on a mysterious shipwreck. Can the Survey Crew use their skills to find a way through the wreck to freedom?

Every Numberblock from One to Fifty gathers at Half-Century Mountain for the Cosmic Eclipse. Together, they can defeat Infinaughty if they stand up and be counted... in song!