Double, Triple and Quadruple Multicubes

Consider that the 2×2 is a pretty doable puzzle?
But what if you join 2 of them together? Or 3?  Or even 4?

Double, Triple or Quadruple Multicubes can get very challenging very quickly!

https://www.mrpuzzle.com.au/catalogsearch/advanced/result/?name=multicube&description=&short_description=&sku=&price%5Bfrom%5D=&price%5Bto%5D=

 

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