Stupid really. For years we've been staring out into space, mapping out galaxies billions of light years away and probing into the depths of black holes when all along, right on our doorstep, was the tenth planet in the solar system. And we didn't even notice it! How phenomenally unobservant.
Predictably enough it turns out to have hostile intentions towards Earth and so you, a spherical, yellow object with a big mouth, are despatched to deal with it and its inhabitants - cute, ghost-like creatures who frequent mazes filled with energy packs and power pills.
Now I know what you're thinking, and must admit that I have to agree. But this is 1989, and things have progressed. The maze is in 3D, Power pills come hurtling towards you. Ghosts leap out at you from the screen, causing you to reel back in terror. You never know what might be lurking round the next corner, and have to react instantly when your ghost-detector signals danger.
While it loses degrees for unoriginality, Planet Ten more than makes up for them in technical merit. The game has a fair turn of speed, and things grow to fill the whole screen as they come towards you.
In the end, though, nothing can hide its roots. PacMan is PacMan, however many dimensions it's displayed in, and addictiveness is affected accordingly. At the asking price, though, definitely worthy of consideration.