My cat love this! He is a slender cat and about 9 pounds, so he fits on and in everything very well. I would recommend a bigger cat condo, if your cat is bigger than mine though. All the tools you need to assemble comes within the package. I am terrible at reading directions, but this was pretty easy for me to put together. My cat went crazy over the mice that come connected to the top tiers, so of course they didn't last very long! Bonus: When my cat was done exploring, he played in the box the condo came in too! (Hope he likes the condo better...)