Play the first few levels of the Game Boy version of Dr Mario and you might start thinking it is better than Tetris.Yet that may all change if you manage to reach the 20th level, a challenge so ridiculously difficult, it'll make you slam shut your 3DS in frustration.
As Dr Mario, you have to clear viruses from the screen by matching coloured pills to the virus. It's a twist on the block puzzler, as pills fall from the top of the screen and you have to press A to rotate them to match the colours.
As this is a Game Boy game, there are only black and white pills and viruses but that doesn't make it any easier. In fact, it forces you to think more than Tetris as you're constantly dealt pills that won't help you destroy the viruses.
It's fun at first, the music is brilliantly catchy and it's just challenging enough as the viruses increase as you progress. However, by the 20th level it just gets stupid as you're presented with a screen that's virtually full of viruses and if you don't get a decent pill straight away, it's pretty much game over. It can be done but you need a combination of luck and skill.
Shorn of the original's multiplayer mode, Dr Mario suffers from a lack of content. Even DSiWare game A Little Bit Of Dr Mario had a Vs CPU mode. You should probably download that instead if you want a Dr Mario game on your 3DS.