Mice are social and should live in pairs/groups. Usually male mice need to be neutered to live harmoniously with others. They're very active and need a good size set-up, filled with toys, tunnels, hammocks. They're usually very interactive too.
Have a look at our 'Mouse housing' section on Pinterest to see some suitable set-ups for mice & enrichment for them
We currently have 3 pairs of neutered boy mice, we'll likely be bonding them into 1 big group soon