The planet Poseidon is having temperature problems. With a population of 7900 million people to protect from certain death you must venture down into the planet's bowels and collect eight crystals which, used together, will save the planet from destruction.
Poseidon - Planet Eleven is a very straight forward game. You search all the locations for the crystals and take them to the centre core where they can react and cool the planet down. The sectors you travel through include grass and mud, molecules and radiation and each have their own breed of mutants ready to stop you in your tracks. The screens are simple with nothing new and exciting to spur you on, but the animation on the hero of the game is out of this world! Or would be if the locations didn't have a roof to them. When you jump the character shoots up the screen at a hellish rate. It's impossible to judge successfully where he's going to land, you just have to hope for the best.
Poseidon - Planet Eleven is nothing new but it's a reasonable arcade adventure.