Well, that was unexpected. Nintendo's latest smartphone game Dr. Mario World has launched a day earlier than planned.

That's right, if you have a compatible Android or iOS device, you should be able to hop on to your download store and install the game as we speak. Over the last few hours it's been rolling out to various countries including the UK, US and Japan, first hitting iOS, and eventually arriving on Android. If it isn't available in your territory just yet, keep checking back as we imagine it won't be long until it appears.

We'll be thoroughly testing the game ourselves here at Nintendo Life, so make sure to keep an eye out for our findings over the next few days.

As a side note, remember that the game is only launching for specific mobile platforms in some countries.

Will you be giving it a go? Have you already started playing? What do you think? Reveal all in the comments below.