This game is titled Hamsterz Life in North America and Hamsterz in Europe and Australia.
Hammy holds more Hamsterz
Hammy will hold more than four Hamsterz for you. It
is possible to have six of them; five with Hammy and one out.
Also, the more Hamsterz you have, the more you can go to the bedroom
and get presents which lead to getting bigger cages faster.
Get a pipe for your hamster to crawl in. If your cage
is too small, a message stating "he cage is too small!"
instead "The cage is too small!".
Strategy guides from GameFAQs