I am an adult who enjoys puzzle games and I really liked this one. The planet has been taken over by monsters and you must "fight" them to see who is the best. You must work your way through a maze of blocks and eliminate 3 monsters. There are 8 worlds with 5 levels each and a boss at the end of each. You can use the A button to push blocks and squash the enemy, or you can pick up special items such as a bubble gun to freeze them, a clock to stop all of them for a few seconds (both of these make them easier to squash) or a bomb to blast them. The enemies can also pick up these items, so get them first! Aside from the 3 you must eliminate, there are others who will harm you, and when you kill them, they will leave a reward to pick up for points, however, they will regenerate. There is a radar screen in the bottom corner which is very helpful when trying to locate the 3 enemies. You accumulate points by eliminating any monster and for the time you have left when all 3 are defeated. You can earn extra lives by getting points, or collecting all of the letters of the words MONSTERS and/or EXTRA. There is a password for each world, but beware, when you use the password, you start at the beginning of the world with zero points and only 4 lives. I think the graphics are great. The monsters are different on each level and the mazes contain unique obstacles. The bosses are a challange, but not impossible to defeat. The levels of difficulty merely increase the speed - whoa it gets fast. I felt this game was well worth the money.