Use your head to break some blocks, move others, while a few enemies try to be annoying to avoid you from solving the many platform puzzles which form this game.
It seems the main character, a walking moai, an Easter Island statue, goes in search of smaller ones with some kind of relation to it. But well, as if one cares with this kind of game, the only impact it have is that you should get them to finish the level, so each one always is the same, but not in the same way. Start somewhere around the place, make your way to them and then reach the big doors to finish the level.
There are a few enemies around, nothing important or dangerous, even though they can kill you. Basically there are three kinds, the small and walking, the big bat spitters and the wall crawlers. Those monsters are just to make things a bit harder, as they are easily thrown away, for a time, with a headbutt, the main tool that helps you to finish the levels.
What is more important than the enemies are the blocks, you will find three types of them, some are floating, others fall when the one under them breaks and the spherical ones roll until hitting another one of falling, passing over any enemy. All of them are broken, or moved, with your head, but as you can only hit left or right there are bombs scattered around the level to break the ones that make the floors.
Sometimes to make things more interesting there will be a special object in the level. Ice where you can't stand still, springs to jump higher, platforms that falls down, fire-throwing moais... but even without them each level is different, each of the around fifty-five levels, each is a another puzzle with a new design.