How do you make your dwarf hamster happy?

I'm not sure what kind of hamster you mean but they all kind of get amused the same. If you don't really want to buy some toys and fun kind of stuff you can easily make something with things around your household- for example... A toilet tube can be fun and amusing for a dwarf hamster, it can hide in it and possibly sleep in it. You can also use an egg carton as a little tunnel kind of thing. I am mainly referring to dwarf hamsters as that is what I know most about but as for Syrian hamsters, maybe it is the same but use bigger things. Hamsters like to dig and search for things, so try and hide some of their food around the cage so they have to search, that might keep them amused. Hope I helped!