Creebies is Nokia's weirdest first party game so far, a sort of cross between (fluff)Friends, Tamagotchi and Animal Crossing. You have to take care of a "Creebi", a small cute monster whose personality and appearance are determined by virtual genes. Amongst other things you decorate its living space, interact with other Creebies in minigames over the internet and through Bluetooth, and even breed new Creebies which take virtual genes from their parents.
Dance Fabulous is an N-Gage-exclusive title that uses the music tracks stored on your device with customised avatars and dance moves.

Dogz combines a cute 3D puppy simulation with a series of arcade mini-games.

The Sims 2 Pets for N-Gage is a 3D pet simulator that concentrates on taking care of a puppy from a choice of five breeds: Chihuahua, Labrador, Mutt (mongrel), Pug and Whippet. There's also an unlockable robot dog if you want to make things more surreal.
The Sims 3 for N-Gage will presumably be a more phone-friendly version of the popular electronic dolls' house simulator.
Spore Origins is the mobile spin-off of the PC game Spore, a simulation of a new life form.
Somewhat defying description, Yamake will allow people to make and share their own mini-games using photos, videos, audio and text from their phone. The games can be shared on the internet through the N-Gage Arena online service.