... FSC wooden toy for hamsters and small animals, ladder for cages that encourages movement and environmental enrichment ... Hamster Habitat Modules. 9 piece kit including hamster tunnel, curves and fittings.
Hamsters are very active, curious creatures and they love to explore new things. Some of the toys that hamsters love include tunnels, tubes, ladders, and exercise wheels. Additionally, you can provide your hamster with interactive toys like treat balls, chew toys, and even cardboard boxes.

Build a hamster tunnel system to connect several different habitat modules, including sleeping areas, towers, turrets, jungle gyms, mazes, and more. After playing and exploring, your cute critter can curl up in a small pet hideout in the shape of a log, wooden hut, or cave made of woven grass hay for some rest and privacy. For more snuggly options, you can hang plush tunnels or covered hammocks in the cage for an elevated sleeping platform.

Amazon.com: hamster tubes and tunnels kit for cage
Whatever type of hamster enclosure you choose, make sure it has adequate room for racing around and digging in fluffy hamster bedding as well as space for hamster toys, hamster hideouts and beds, sleep areas and a food and water station. Ensure your hamster gets enough exercise by providing hamster wheels & balls to run in, and consider outfitting your hamster cage with tunnels and platforms, or getting an enclosure that has them built in, for extra fun.