One More Line. It's right there in the title - developer SMG Studio knows how hard it is to put its game down once you start playing.

I've been reciting it as I play. "One more line," I say, "just one more damn line... please!"

All you have to do is hold your finger on the screen to make your flying disco ball latch on to one of the circles around it with a rainbow grappling hook.

Once it's on, it spins around the circle until you let go. At which point, it is flung in the direction it was spinning in.

Keep doing this, over and over, and you accumulate points while drawing multi-coloured lines behind you. It's fun and almost feels like a weird way of drawing.

The problem is that it's easy to crash. If you disco ball hits the sides of the tunnel it's travelling down, you crash. If it hits another circle while spinning around, you crash. Get it?

This is a game for those who love Super Hexagon, and all of those other tough-but-simple arcade games. It fits into that category with flying colours.

You can download One More Line for free on the UK and US App Stores at midnight.