Snake is a classic game that was incredibly popular back when Nokia ruled the mobile phone market and if you are craving a modern version for your smartphone, Slither.io is brilliant!

This game is everywhere and it is even on the web and you can play it in a web browser on your computer by going to slither.io. Here I take a look at the iPhone version, which enables you to have a quick game whenever you have a few minutes to spare, standing in a queue, on your daily commute and so on.

Slither.io is not quite the same as the original snake, but it is very similar. For a start, it is a lot more colourful and has simple, but great graphics. There are two game modes and you can either play online with other people around the world or you can play on the phone against the game A.I.

When the game starts you are a small snake and it must be guided around the screen. There are three control methods to choose from and the default is to follow an arrow that in turn follows your finger as you move it around. Controlling the snake is easy and it is responsive.

The game area is very large and is much larger than the screen, so it scrolls as you near the edges.

There are also other snakes moving around and these are controlled by either real people or the game A.I. depending on the gameplay you selected. If you play online you can see the names and scores of the other players in the top right corner of the screen and your snake length is displayed in the bottom left corner.

In the original Snake game, you died if you ran into your own tail, but in Slither.io it is quite safe to run over it while twisting and turning. However, you die if you run headfirst into another snake and they die if they run into you.

Of course, you can deliberately try to make another snake run into you and kill it by getting in its way, and they may try to do the same to you.That is part of the challenge, but other snakes mostly try to avoid you though.

There are coloured dots around the screen and this is food. Eating them makes your snake grow and it becomes both longer and fatter. Larger dots grow you more and some dots fly away from you and try to avoid being eaten.

There is a speed-up button that increases your slithering speed so you can catch them, and it is also useful for avoiding other snakes that are getting too close.

There isn't a lot of depth to the game and it is a very simple idea, but it is addictive and great fun, just as the original Snake was.

In this version you can customise your snake and choose the colours and design that make up its segments as it grows.

Slither.io is excellent and has a high rating on the iPhone App Store. If you want a simple, addictive, fun game to play, add it to your collection.