Super Mario Run arrives on the iPhone

Super Mario Run has hit the iPhone. Is it worth $10? Here's what you need to know.

It plays with one-finger tapping, and Mario keeps running nonstop.

You can also compete with friends to score points for bragging rights.

Winning Rally matches earns you Toad followers and coins.

With those, you can get little upgrades...

...to your little Mushroom Kingdom. Consider these trophies, or badges.

Unlocking those bonuses takes time.

There are also extras you can earn with points...

You'll need tickets to play Rally matches.

Achievements earn extra points. This part gets confusing.

The free version of the game has three levels to play, but to get the rest you need to pay $10.

Here's what you get for $10: 21 more levels, and more coins and tickets.

You can't play offline: if you do, you get an error message.

I didn't get as into Kingdom Builder mode, but kids might like adding customized trees to decorate.

A look at all the worlds and levels to play.

Some levels play like puzzles.

Others feel like classic Mario.

What could keep you coming back, though, are the rematches against others.

Leveling up and earning extras could be a reason to keep playing.