[alpacassei]

Russian dwarfs (yours will be a hybrid not a pure Campbells) need atleast 70 x 40cm of continuous floor space. I’m not sure what cage are available in Brazil but you should be able to find a storage bin large enough that you could convert into a cage. Unfortunately even with a playpen, being in a small cage causes serious stress and cage aggression.

For actual toys, I recommend bendy bridges, cork tunnels, and Apple wood chews but without a large enough cage, its difficult to add enough toys and hides to create a stimulating environment